Comes out disguised as the Pokémon in the party's last spot.

The immune system of the Pokémon prevents it from getting poisoned. If a poisoned Pokémon has Immunity as its original Ability but not its current Ability, it will remain poisoned when switched out.If the Pokémon with this Ability is poisoned and is holding a Pecha or Lum Berry, the Berry will be eaten and cure the Pokémon of poison before Immunity has a chance to activate.A Pokémon with Immunity can be poisoned by Sunsteel Strike if the attacker has Poison Touch, but will be cured of poison immediately.

On switch-in, this Pokemon Transforms into the opposing Pokemon that is facing it. If there is no Pokemon at that position, this Pokemon does not Transform.

Passes through the opposing Pokémon's barrier, substitute, and the like and strikes.

When a Pokémon with this Ability is knocked out by an opponent's attack, it deals damage to that opponent equal to the amount of HP it had left before last being hit. If a Pokémon with this Ability faints through Future Sight or Doom Desire, Innards Out will only activate if the user of the move is still on the field. If a Pokémon with this Ability moves first and is then knocked out by Core Enforcer, Innards Out will not activate. If Innards Out causes two opposing Pokemon to faint at the same time, and neither party has any remaining Pokémon, then the Pokémon that activated Innards Out loses.

Inner Focus prevents the Pokémon from flinching. However, Pokémon with this Ability can still flinch to a Pokémon with Mold Breaker, Teravolt or Turboblaze.

Insomnia prevents the Pokémon from being afflicted by sleep and Yawnn. Rest will fail when used by the Pokémon. A Pokémon with this Ability will wake up if it is asleep in battle (such as if it gains the Ability outside of battle or by an effect like Skill Swap, or is put to sleep by a Pokémon with an Ability like Mold Breaker).

When a sleeping Pokémon with Insomnia enters battle, it will be cured of sleep. If a sleeping Pokémon has Insomnia as its original Ability but not its current Ability, it will remain asleep when switched out. If the Pokémon with this Ability is asleep and is holding a Chesto or Lum Berry, the Berry will be eaten and cure the Pokémon of sleep before Insomnia has a chance to activate.

On switch-in, this Pokemon lowers the Attack of adjacent opposing Pokemon by 1 stage. Pokemon behind a substitute are immune.

Pokemon making contact with this Pokemon lose 1/8 of their maximum HP, rounded down.

This Pokemon's punch-based attacks have their power multiplied by 1.2.
All moves that are amplified:

Drain Punch, Thunder Punch, Ice Hammer, Ice Punch, Fire Punch, Shadow Punch
Hammer Arm, Sky Uppercut, Dizzy Punch, Comet Punch, Mega Punch, Double Iron Bash, Bullet Punch, Plasma Fists, Focus Punch, Meteor Mash, Power-Up Punch, Mach Punch, Dynamic Punch

Being hit by a Dark-type move boosts the Attack stat of the Pokémon, for justice.

Prevents other Pokemon from lowering this Pokemon's accuracy stat stage. This Pokemon ignores a target's evasiveness stat stage.

The Pokémon can't use any held items.

During harsh sunlight, Leaf Guard prevents the Pokémon from being afflicted by non-volatile status conditions and Yawn (including via the Flame Orb and Toxic-Orb). It has no effect on any current status condition prior to the weather being set up.

If a Pokémon with this Ability is drowsy due to Yawn, if there is harsh sunlight when it would fall asleep, the Ability activates and keeps it awake.

By floating in the air, the Pokémon receives full immunity to all Ground-type moves.

The user's weight is halved. This may decrease the damage taken from Low Kick and Grass Knot, increase the damage taken from Heavy Slam and Heat Crash, and lower the base power of the user's Heavy Slam and Heat Crash.

This Pokemon is immune to -type moves and raises its Special Attack by 1 stage when hit by an -type move. If this Pokemon is not the target of a single-target -type move used by another Pokemon, this Pokemon redirects that move to itself if it is within the range of that move.

Limber prevents the Pokémon from being afflicted by paralysis. A Pokémon with this Ability will be cured of paralysis if it is paralyzed while in battle (such as if it gains the Ability outside of battle or by an effect like Skill Swap, or is paralyzed by a Pokémon with an Ability like Mold Breaker).

Liquid Ooze causes HP-draining moves used on the Pokémon with this Ability to damage their user instead of healing them.

If a Pokémon with Liquid Ooze is hit by a draining move such as Giga Drain or Leech Life (including the status move Strength Sap), or takes damage from the effect of Leech Seed, the amount of HP that would be recovered by the opponent is dealt as damage instead (after applying the effect of Big Root). The damage dealt by the move is not affected.

Even if the user of the HP-draining move cannot heal from its effect due to having full HP or the effect of Heal Block, it will still take damage

The Ability affects the following moves:
Drain Punch, Absorb, Leech Life, Draining Kiss, Leech Seed, Giga Drain, Horn Leech, Strength Sap, Mega Drain, Parabolic Charge, Dream Eater, Oblivion Wing

All sound-based moves become Water-type moves.