Status Ailments

NOTE: When this section speaks of 'rounding down', which is quite often, it always applies that if rounding down would make the result zero, it is made one instead. I have not bothered to mention this every time it appears, so just be aware of it as you read.

The Pokémon games have since the days of Red, Blue and Yellow included a number of status ailments, conditions caused by various moves which affect your Pokémon in some way for a number of turns after the use of the original move. The mechanics behind these effects can be quite complex and are often misreported.

Fundamentally, status ailments are split into two types, "major" and "minor". Major status ailments are shown near your Pokémon's HP bar in battle and stay there until the Pokémon is cured, whether by items, a trip to the Pokémon Center, or some other condition which cures the status ailment. A Pokémon can only be afflicted with one major status ailment at a time, making it immune to all others for as long as the current effect lasts. Minor status ailments, however, are invisible, disappear as soon as you switch the Pokémon in question out of battle, and they will stack freely on top of one another. It is somewhat nebulous what actually "counts" as a minor status ailment as opposed to just an unusual move effect, but I will cover the most common ones.

Major Status Ailments

The major status ailments are sleep (SLP), poisoning (PSN), paralysis (PAR), burning (BRN) and freezing (FRZ). Poisoning also has a more sinister variant, "bad poisoning". These have been the major statuses since the first games and it is unlikely more will ever be introduced.

The following applies to all major status ailments:

Moves

The move Safeguard will prevent major status afflictions from being inflicted upon Pokémon in the user's team for the next five turns.
The moves Heal Bell and Aromatherapy will heal all status conditions of Pokémon in the user's party, except in the case of Pokémon with the Soundproof ability before Black and White, which will not be cured by Heal Bell.
If a Pokémon uses the move Lunar Dance or Healing Wish, it will faint and the next Pokémon sent out will be fully healed, including all status conditions.
The move Psycho Shift will cause the user's major status ailments to be transferred onto the target.
The move Rest will put the user to sleep, eliminating any previous major status ailments (and confusion).
In Red, Blue and Yellow, using the move Haze will cure any major status ailment the opponent has (but not the user).
The move Hex deals double damage to a Pokémon afflicted by any major status ailment.

Abilities

A Pokémon with the ability Natural Cure will be healed of all major status ailments when it leaves battle.
A Pokémon with the ability Shed Skin will every turn have a 1/3 chance of being cured of any major status ailments it has. In a similar vein, a Pokémon with the ability Hydration will at the end of every turn be cured of all major status ailments if it is raining.
A Pokémon with the ability Leaf Guard cannot receive major status ailments during Sunny Day. It will not be cured of previous status ailments when the ability activates. Until Black and White, this ability would not prevent self-induced status ailments, such as sleep from Rest.
When afflicted with a major status condition, a Pokémon with the ability Guts has its Attack increased by 50%, a Pokémon with the ability Marvel Scale has its Defense increased by 50%, and a Pokémon with the ability Quick Feet has its Speed increased by 50%.
A Pokémon with the ability Healer has a 30% chance of curing each adjacent ally in a double or triple battle from any major status ailments at the end of every turn.

Items

Any major status ailment can be cured in and outside of battle with a Full Heal, Full Restore, Heal Powder, Lava Cookie, Old Gateau or Casteliacone.
In G/S/C, the Miracleberry will cure any status ailment, while in Advance onwards, it is the Lum Berry.

Sleep

When a Pokémon falls asleep, a number (the "sleep counter") representing the number of turns the Pokémon will sleep is randomly generated. The range of this number has been steadily decreasing; in the fifth generation, it ranges between one and three (inclusive), but in the fourth it was between one and four, in the third it was between one and six, and prior to that it was between one and seven. Both Pokémon Stadium games also changed the maximum value of the sleep counter to three. At the beginning of a sleeping Pokémon's turn, it will wake up and use its selected move as normal if the sleep counter is zero, and otherwise the sleep counter is is decreased by one and a "[Pokémon's name] is fast asleep" message is displayed.

In the fifth generation, switching the Pokémon out and back in again will reset the counter to whatever it was when the Pokémon first fell asleep. In the third and fourth generations, the counter was frozen when the Pokémon was switched out, so that if it had one turn remaining when it was switched out it would still have one turn remaining when it was switched in again. Before that, it was re-randomized whenever a sleeping Pokémon was sent into battle.

If the Pokémon fell asleep by using Rest, the sleep counter always starts at two.

In Red, Blue and Yellow, the sleep counter would be checked after it was decremented, waking the Pokémon up immediately with a "[Pokémon] woke up!" message if the counter had reached zero. As the Pokémon would not be allowed to attack on the turn it woke up, the only thing this actually changed was that the opponent knew of the waking-up earlier.

Moves

The moves Spore (100% accurate), Dark Void (80% accurate), Sleep Powder (75% accurate), Lovely Kiss (75% accurate), Hypnosis (60% accurate except in Diamond and Pearl where it is 70%), Sing (55% accurate) and Grasswhistle (55% accurate) induce sleep as a primary effect.
The move Yawn (cannot miss) causes the target to fall asleep as a primary effect at the end of the turn after Yawn is used.
The move Rest (cannot miss) puts the user to sleep for two turns while removing all damage that has been done to it, as well as all major status ailments and confusion, as a primary effect.
The move Relic Song has a 10% chance of putting the target to sleep as a secondary effect.
The move Secret Power, when used in a grass or tall grass environment (as well as the Waterfall and Sunny Park colosseums in Pokémon Battle Revolution), has a 30% chance of putting the target to sleep as a secondary effect.
The moves Dream Eater and Nightmare have the peculiarity of only working while the target is asleep, while Snore and Sleep Talk only work while the user is asleep. If the target of the move Wake-Up Slap is asleep, the move does double damage and the target wakes up.
When the move Uproar is used, it causes an effect lasting for three turns (prior to the fifth generation, it could last anywhere from 2-5 turns) which prevents all Pokémon in the field from falling asleep (and forces the user of Uproar to continue using it).
The move Worry Seed causes the target to acquire the ability Insomnia, which (as described below) prevents sleep.

Abilities

The ability Effect Spore causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of either falling asleep, being paralyzed or poisoned.
The abilities Insomnia and Vital Spirit prevent the Pokémon from sleeping (and will cause a Pokémon that acquires the ability while asleep to wake up). This includes self-induced sleep from Rest and thus causes the move to fail entirely.
The ability Early Bird causes two to be subtracted from the sleep counter every turn rather than one.
The ability Bad Dreams, exclusive to Darkrai, causes opposing Pokémon to lose 1/16 of their HP every turn while they are asleep. This is independent of the Nightmare status condition.

Items

The item Awakening can be used in or out of battle to wake up a sleeping Pokémon.
In R/B/Y and FR/LG, the Poké Flute could also be used repeatedly for this purpose in battle. In fact, using the Poké Flute immediately would always pay in R/B/Y, as a Pokémon always took a turn to wake up anyway - but the catch was that if the opponent was also asleep for one reason or another, it would wake up too. In Advance onwards, the Blue Flute can be used in the same way but will not wake up the opponent.
In G/S/C, the berry used to cure sleep was the Mint Berry. In the Advance games onwards, it is the Chesto Berry.

Types

Grass and Bug Pokémon have more of a tendency to learn sleep-inducing moves than others, and many Psychic Pokémon can learn Hypnosis, but sleep has no solid association with any particular type.

Other Notes

Sleep is the only status ailment it has ever been possible to find a wild Pokémon already afflicted with at the beginning of a battle. This happens when you Headbutt trees in G/S/C; nocturnal Pokémon such as Hoothoot will be sleeping if you Headbutt them out of a tree in the day and diurnal Pokémon such as Caterpie will be sleeping if you Headbutt them out of a tree in the night. I think. I didn't do any extensive testing, so they might not always be sleeping. Sadly, they did not reintroduce this in HG/SS.

In Colosseum and XD's story modes, Pokémon can be woken from sleep by calling out to them in battle - this is the fourth battle option along with "Fight", "PKMN" and "Item".

Poisoning

When a Pokémon is poisoned in battle, it will lose 1/8 of its total HP (or 1/16 in Red, Blue and Yellow), rounded down, at the end of every turn. Pre-Advance, this effect took place immediately after the poisoned Pokémon attacked rather than at the end of the turn and would fail to happen if the poisoned Pokémon had knocked out the opponent on that turn. It lasts until the poisoning is cured, i.e. it does not wear off naturally.

When a Pokémon is badly poisoned in battle, a variable T is set to 0. At the end of every turn (or, pre-Advance, after the poisoned Pokémon attacks), T is incremented by one and the Pokémon loses HP equal to 1/16 of its total HP, rounded down, multiplied by T. T has a maximum value of 15 and is reset to 0 whenever a badly poisoned Pokémon is sent out in battle.

Bad poisoning always reverts to ordinary poisoning outside of battle. Pre-Advance, bad poisoning also reverted to ordinary poisoning when the badly poisoned Pokémon switched out; on the other hand, if a badly poisoned Pokémon used Baton Pass, T would be passed on and if the new Pokémon was poisoned, even normally, T would continue to increase.

Outside of battle, prior to Black and White, a poisoned Pokémon will lose one HP every four steps that the player walks. In the fourth generation, it will be automatically cured of its poisoning instead of losing its last HP, so that it cannot faint outside of battle.

Moves

The moves Poison Gas (90% accurate; was 55% before Black and White) and Poisonpowder (75% accurate) induce poisoning as a primary effect. The move Toxic (90% accurate; was 85% before Black and White) induces bad poisoning as a primary effect.
The moves Smog (40%), Poison Sting (30%), Sludge (30%), Sludge Bomb (30%), Poison Jab (30%), Gunk Shot (30%), Twineedle (20%), Poison Tail (10%), Cross Poison (10%) and Sludge Wave (10%) have the indicated chances of inducing poisoning as a secondary effect. The move Poison Fang has a 30% chance of inducing bad poisoning as a secondary effect.
If the move Toxic Spikes has been used once by the opponent, any Pokémon you send into battle will be poisoned if it is not afflicted by a major status condition already. If Toxic Spikes has been used twice by the opponent, any Pokémon you send into battle are badly poisoned if not already afflicted by a major status condition.
The move Facade is doubled in power when the user is poisoned.
The move Refresh heals the user of poisoning.
The move Fling can poison the opponent if the user is holding a Poison Barb or Black Sludge. If the user is holding a Toxic Orb, the opponent will be badly poisoned.

Abilities

The ability Immunity prevents a Pokémon from being poisoned (and will cause a Pokémon that acquires the ability while poisoned to be cured, though if it later loses the ability again the poisoning will return).
The ability Poison Point causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of being poisoned.
The ability Effect Spore causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of either falling asleep, being paralyzed or poisoned.
The ability Poison Touch causes any physical contact moves used by this Pokémon to have an additional 30% chance of poisoning the target.
When a Pokémon with the ability Synchronize is poisoned directly by a move, the Pokémon that used the move is also poisoned. If the Pokémon with Synchronize is badly poisoned, the Pokémon that used the move is poisoned normally prior to Black and White.
When a Pokémon with the ability Poison Heal is poisoned, it recovers 1/8 of its HP every turn instead of losing it. The T counter does not affect this; the recovery is the same whether the poisoning is bad or normal.
When a Pokémon with the ability Toxic Boost is poisoned, its Attack is increased by 50%.

Items

Poisoning can be cured in and outside of battle with an Antidote.
G/S/C's berry to heal poisoning was the Psncureberry. The post-Advance berry that heals poisoning is the Pecha Berry.
When a Pokémon holds a Toxic Orb, it is badly poisoned at the end of each turn.

Types

Any Poison-type Pokémon cannot be poisoned under any circumstances. The poisoning status ailment is highly associated with the Poison-type; only one move of another type (Twineedle) is able to inflict it. Steel-type Pokémon are also wholly immune to being poisoned as of the fourth generation, being immune to the Poison-type.

Paralysis

When a Pokémon is paralyzed, its Speed is cut to 1/4 of its previous value and this effect lasts for as long as the paralysis remains. Every turn, it also has a 25% chance of being "fully paralyzed", which prevents it from making a move.

In Gold, Silver and Crystal, if a paralyzed Pokémon Baton Passed to another paralyzed Pokémon, the second one would not have its Speed reduced until a move which affected the Speed stat modifier, recalculating its Speed, was used. In Pokémon Stadium 2, the new Pokémon's Speed is reduced if the last Speed-modifying attack used was one that raised Speed, while it will not be reduced if the new Pokémon uses a Speed-modifying attack.

In Red, Blue and Yellow, changing the Speed modifier of a paralyzed Pokémon would reset the Speed to act as if the Pokémon were not paralyzed; for example, if you had a paralyzed Pokémon and it used Agility, the Pokémon's final Speed would be the same as if it had used Agility and were not paralyzed at all. Rest would also not fix the Speed reduction from paralysis although it would cure the paralysis itself. In Pokémon Stadium, both of these errors were fixed. Additionally, using the move Haze would cure a paralyzed user's Speed drop until it was next switched in.

Moves

The moves Thunder Wave (100% accurate), Glare (90% accurate) and Stun Spore (75% accurate) induce paralysis as a primary effect.
The moves Zap Cannon (100%), Body Slam (30%), Bounce (30%), Discharge (30%), Dragonbreath (30%), Force Palm (30%), Freeze Shock (30%), Lick (30%), Spark (30%), Thunder (30%), Bolt Strike (20%), Thunder Fang (10%), Thunderbolt (10%), Thunderpunch (10%), Thundershock (10%), Volt Tackle (10%) and Tri Attack (20% chance of either burn, paralysis or freezing) have the indicated chances of inducing paralysis as a secondary effect.
The move Secret Power, when used in a building or in the Main Street, Neon and Courtyard Colosseums of Pokémon Battle Revolution, has a 30% chance of paralyzing the target as a secondary effect.
The move Facade is doubled in power when the user is paralyzed.
If the target of the move Smellingsalt is paralyzed, the move is doubled in power and the target cured of paralysis.
The move Refresh heals the user of paralysis.
The move Fling can paralyze the opponent if the user is holding a Light Ball.

Abilities

The ability Limber prevents a Pokémon from becoming paralyzed (and will cause a Pokémon that acquires the ability while paralyzed to be cured).
The ability Static causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of being paralyzed.
The ability Effect Spore causes any Pokémon that uses a physical contact move on this Pokémon to have a 30% chance of falling asleep, being paralyzed or poisoned.
When a Pokémon with the ability Synchronize is paralyzed directly by a move, the Pokémon that used the move is also paralyzed.
When a Pokémon with the ability Quick Feet is paralyzed, the normal Speed drop from the paralysis is ignored, in addition to the 50% Speed boost granted by the ability for any major status ailment.

Items

In-game, paralysis is cured with a Parlyz Heal both in and out of battle.
In G/S/C, the Przcureberry healed paralysis. In Advance onwards, it is the Cheri Berry which has this purpose.

Types

Paralysis is associated with the Electric-type as nearly all damaging Electric-type moves may cause paralysis as a secondary effect, and the Static ability, which only Electric Pokémon have, causes paralysis upon contact. It is nowhere near exclusive to Electric-types, however, being the most common major status ailment in the game, and they are not themselves immune to being paralyzed - nor are Ground-types, even when the cause of the paralysis seems electricity-related, such as with the Static ability.

Burning

When a Pokémon is burned, the damage it deals with physical attacks is halved, and at the end of every round, it loses 1/8 of its total HP (1/16 in Red, Blue and Yellow), rounded down. Pre-Advance, this effect took place immediately after the burned Pokémon attacked every turn and would not take place if the burned Pokémon had just knocked out the opponent.

In Red, Blue and Yellow, using moves that changed the Attack modifier on a burned Pokémon would cause the Attack drop from the burn to be ignored when the new Attack was applied. The Attack drop would also not disappear if the burned Pokémon used Rest. Both were fixed in the original Pokémon Stadium. Additionally, the move Haze would cure the user's Attack drop if it was burned until it was next switched in.

In Pokémon Stadium, a Pokémon would not be subjected to burn damage on the turn it switched in if it was already burned.

Moves

The move Will-O-Wisp (75% accurate) induces burns as a primary effect.
The moves Inferno (100%), Sacred Fire (50%), Ice Burn (30%), Lava Plume (30%), Scald (30%), Searing Shot (30%), Blue Flare (20%), Blaze Kick (10%), Ember (10%), Fire Blast (10%), Fire Fang (10%), Fire Punch (10%), Flame Wheel (10%), Flamethrower (10%), Flare Blitz (10%), Heat Wave (10%) and Tri Attack (20% chance of either burn, paralysis or freezing) have the indicated chances of inducing a burn as a secondary effect.
The move Facade is doubled in power when the user is burned.
The move Refresh heals the user of burning.
The move Fling can inflict a burn if the user is holding a Flame Orb.

Abilities

The ability Water Veil makes the Pokémon immune to being burned (and will cause a Pokémon that acquires the ability while burned to be cured).
The ability Flame Body causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of being burned.
When a Pokémon with the ability Synchronize is burned directly by a move, the Pokémon that used the move is also burned.
When a Pokémon with the ability Guts is burned, the normal Attack drop from the burn is ignored, in addition to the 50% Attack boost granted by the ability for any major status ailment.
When a Pokémon with the ability Flare Boost is burned, its Special Attack is increased by 50%.

Items

In-game, burns are cured with a Burn Heal both in and out of battle.
G/S/C's burn-healing berry was the Ice Berry. In Advance onwards, it is the Rawst Berry which serves this purpose.
When a Pokémon holds a Flame Orb, it is burned at the end of each turn.

Types

Burning is, naturally, associated with Fire-types; most damaging Fire attacks can cause a burn as a secondary effect, only a few non-Fire-type attacks can burn, and Fire-types themselves are immune to being burned, as well as the exclusively Fire-type Flame Body ability causing burns on contact.

Freezing

Freezing is the rarest major status ailment, being only caused as a 10% secondary effect by a few moves. When a Pokémon is frozen, it is unable to attack. In R/B/Y, a frozen Pokémon would be frozen indefinitely unless cured. However, G/S/C introduced a 25/256 (10%) chance for a frozen Pokémon to be naturally defrosted every time it attempts to make a move, and in the third generation this chance was boosted to 20%, which it has remained since.

Moves

There is no move that induces freezing as a primary effect.
The moves Blizzard, Ice Beam, Ice Fang, Ice Punch and Powder Snow each have a 10% chance of freezing the target as a secondary effect. The move Tri Attack has a 20% chance of either burning, paralyzing or freezing the target as a secondary effect.
If a frozen Pokémon uses Flame Wheel, Flare Blitz, Fusion Flare, Sacred Fire or Scald, it will be automatically defrosted on that turn.
During the effects of Sunny Day, no Pokémon can be frozen.

Abilities

The ability Magma Armor makes the Pokémon immune to being frozen.
The ability Drought causes sunny weather, during which no Pokémon can be frozen.

Items

Freezing is cured with an Ice Heal in and out of battle.
G/S/C's berry to cure freezing was the Burnt Berry. The Advance-onwards berry is the Aspear Berry.

Types

Freezing is of course associated with Ice-types, freezing being exclusively a side-effect of most Ice moves plus Tri Attack. Ice-types are immune to being frozen.

Whenever a frozen Pokémon is hit by a damaging Fire-type attack, it is automatically defrosted.

Minor status ailments

The most common and noteworthy minor status ailment is confusion. Flinching is also well-known. Otherwise, however, they are a disparate, nebulously defined bunch and many of the choices I made for what to include and what not to were rather arbitrary.

Confusion

When a Pokémon becomes confused, a random confusion counter between two and five is generated. At the beginning of the confused Pokémon's turn, this number is decreased by one; if it is now zero, the Pokémon snaps out of confusion, but otherwise it has a 50% chance of attacking itself with a typeless 40 base damage physical attack which cannot be a critical hit and ignores the effects of Reflect and Helping Hand but otherwise follows the ordinary damage formula with the same Pokémon as both attacker and defender. The confusion counter is not decremented if the Pokémon does not actually attempt to make an attack, such as if it is asleep, frozen or flinched this turn, if it is recharging after Hyper Beam or a similar attack, or if the game is R/B/Y and the Pokémon is currently trapped by Wrap, Fire Spin, Clamp or Bind.

Moves

The moves Confuse Ray (100% accurate), Flatter (100% accurate), Teeter Dance, Swagger (90% accurate), Sweet Kiss (75% accurate) and Supersonic (55% accurate) inflict confusion as a primary effect. Swagger, notably, raises the target's Attack by two stages at the same time, which causes it to inflict twice as much confusion damage to itself; Flatter raises Special Attack by one stage, but as confusion damage is physical, this does not actually help the user's cause.
The moves Dynamicpunch (100%), Chatter (1%, 11% or 31%, depending on the recorded sound), Hurricane (30%), Dizzy Punch (20%), Rock Climb (20%), Water Pulse (20%), Confusion (10%), Psybeam (10%) and Signal Beam (10%) have the indicated chances of inducing confusion as a secondary effect.
The moves Thrash, Petal Dance and Outrage cause the user to attack blindly for two or three turns and become confused afterwards.
The move Safeguard will prevent confusion from being inflicted upon Pokémon in the user's team for the next five turns.

Abilities

The Own Tempo ability makes the Pokémon immune to confusion (and will cause a Pokémon that acquires the ability while confused to be cured).
The Tangled Feet ability causes the Pokémon's evasion to rise when confused (more specifically, the accuracy of moves targeting it is halved).

Items

Confusion can be cured in battle with a Full Heal, but it does not have its own designated healing item.
G/S/C added the Bitter Berry to cure confusion, and in Advance onwards its role has been taken over by the Persim Berry.
The Yellow Flute introduced in Ruby and Sapphire snaps a Pokémon out of confusion in battle and is reusable.
A number of berries in Advance onwards restore 1/8 of the Pokémon's total HP in a pinch (when the current HP is below half of the total) but also confuse any Pokémon that dislikes their primary taste according to its nature. These are the Figy Berry (Spicy), Wiki Berry (Dry), Mago Berry (Sweet), Aguav Berry (Bitter) and Iapapa Berry (Sour).
G/S/C's Berserk Gene item raised a Pokémon's Attack by two stages (doubled it) and gave the Pokémon a confusion counter of 255 when sent out in battle, effectively making it permanently confused. In Stadium 2, the Berserk Gene would only generate ordinary confusion, with the confusion counter being a random number between two and five as usual.

Types

Confusion is vaguely associated with Psychic Pokémon since the move "Confusion" is a Psychic move and it and Psybeam have a 10% chance of inflicting confusion, but this connection is only very loose. No types are immune to confusion.

Flinching

In order to make a Pokémon flinch, the attacker has to strike first and hit a target with a move that can induce flinching. If the target flinches, it will not execute its chosen attack on that turn, but there are no subsequent ill effects.

Moves

Flinching is a secondary effect of a large number of moves, namely Fake Out (100%), Air Slash (30%), Astonish (30%), Bite (30%), Headbutt (30%), Heart Stamp (30%), Icicle Crash (30%), Iron Head (30%), Needle Arm (30%), Rock Slide (30%), Rolling Kick (30%), Sky Attack (30%, Advance onwards only), Snore (30%), Steamroller (30%), Stomp (30%), Dark Pulse (20%), Dragon Rush (20%), Twister (20%), Waterfall (20%, fourth-generation onwards), Zen Headbutt (20%), Bone Club (10%), Extrasensory (10%), Fire Fang (10%), Hyper Fang (10%), Ice Fang (10%), Thunder Fang (10%). Fake Out is here special in the 100% flinch rate and the fact it has a priority of 1, meaning it goes before normal moves and will always manage to flinch the opponent unless it uses a high-priority move as well; however, obviously it has a catch, that being that it can only be used on the user's first turn after being switched in.
The move Fling can cause guaranteed flinching if the user is holding a King's Rock or a Razor Fang. Naturally, it can only be used once unless the item is recycled.

Abilities

The ability Inner Focus makes the Pokémon immune to flinching.
The ability Steadfast makes the Pokémon's Speed modifier increase by one whenever it flinches.
In the fifth generation, the ability Stench grants all of the Pokémon's moves an extra 10% chance of flinching, provided it moves first.

Items

There are no items that cure flinching, as flinching only lasts one turn and can by definition not be predicted and healed beforehand.
The hold items King's Rock and Razor Fang cause most or all damaging attacks that do not already have a chance of inducing a flinch to have a 10% chance of doing so. This does not stack with the Stench ability.

Types

Flinching has no association with any particular type, and no type is immune to flinching.

Seeding

When a Pokémon is seeded, 1/8 (1/16 in R/B/Y) of its total HP, rounded down, is drained from it at the end of every turn. The user of Leech Seed (or another Pokémon that has been switched in in its stead) then recovers the same number of hit points that the seeded Pokémon lost.

Pre-Advance, this effect took place immediately after the seeded Pokémon's turn and would not occur if the seeded Pokémon had just knocked out an opponent.

In Red, Blue and Yellow, the T counter of a badly poisoned Pokémon would also multiply the damage inflicted by seeding due to a glitch.

Moves

Seeding is only inflicted by one move, Leech Seed (90% accurate).

Abilities

If a Pokémon with the ability Liquid Ooze is seeded, the user of Leech Seed loses the same number of HP as the seeded Pokémon every turn rather than gaining them.

Items

The item Big Root, when attached to a Pokémon that has used Leech Seed or replaced a user of Leech Seed, will cause it to recover 30% more HP (rounded down) than the seeded Pokémon loses each turn.

Types

Grass-type Pokémon are immune to seeding, and Leech Seed is only learned by Grass-type Pokémon (though other Pokémon can of course benefit from it by being switched in to replace a Leech Seed user).

Infatuation

When a Pokémon is infatuated, it will have a 50% chance every turn of being "immobilized by love", causing it to be unable to attack that turn. This applies even if the target of the infatuated Pokémon's selected move is not the Pokémon that infatuated it.

It is only possible under any circumstances to infatuate a Pokémon of the opposite gender. Genderless Pokémon cannot infatuate any other Pokémon, nor can they be infatuated themselves.

Infatuation lasts until the infatuated Pokémon is switched out or the Pokémon that infatuated it leaves the battle.

Moves

Infatuation is only inflicted by one move, Attract.

Abilities

The ability Oblivious prevents the Pokémon from being infatuated.
The ability Cute Charm causes any Pokémon that uses a move that makes physical contact against this Pokémon to have a 30% chance of being infatuated, provided it is of the opposite gender.

Items

The item Destiny Knot, when held by a Pokémon, causes any Pokémon that infatuates it to automatically become infatuated with this Pokémon as well.
The item Mental Herb, when held by a Pokémon, will automatically be consumed if it becomes infatuated and cure the infatuation.
The item Red Flute will automatically cure a Pokémon of infatuation when used in battle and is reusable.

Types

No types have any particular association with infatuation, as the Attract TM is one of those that can be learned by almost any gendered Pokémon (all except Nincada, Larvesta and Volcarona, plus Cryogonal and Mew) capable of learning TMs and the only Pokémon immune to it are genderless ones. However, players are likely to mentally associate it with the Normal-type because of Whitney, the Goldenrod City Gym leader from G/S/C who used Attract and gave the TM to the player after beating her, and the fact that the only Pokémon that naturally get the Cute Charm ability are Normal-types.

Curse

When a Pokémon is cursed, it loses 1/4 of its total HP, rounded down, at the end of every turn (or, in G/S/C, immediately after it attacks). This effect lasts until the Pokémon is switched out or faints.

Moves

Curse is inflicted only by the move Curse, and only when it is used by a Ghost-type Pokémon. It will curse the target at the cost of half of the user's HP, rounded down.

Abilities

No abilities are associated with this status ailment.

Items

No items are associated with this status ailment.

Types

As previously noted, only Ghost-type Pokémon can employ Curse to inflict this status ailment. They are, however, not immune to having it inflicted on them.

Nightmare

When a sleeping Pokémon is given a nightmare, it loses 1/4 of its total HP, rounded down, at the end of every turn (or, in G/S/C, immediately after the "[Pokémon's name] is fast asleep" message for the affected Pokémon). The effect lasts until the Pokémon wakes up or is switched out.

Moves

Nightmares are only inflicted by the move Nightmare. If Nightmare is used on a Pokémon that is not already asleep, the move fails.

Abilities

No abilities are associated with this status ailment.

Items

No items are associated with this status ailment.

Types

Nightmare is a move very related to the Ghost-type Curse, but most Pokémon associated with sleep moves of any sort could learn the G/S/C TM for it and no type is immune to it, so it does not have any real affiliations with any particular type.

Page last modified June 11 2011 at 19:03 GMT