When a Pokemon with the Illusion ability switches into battle, it takes the form of the Pokemon in last place (6th) of the player's party. Illusion will not activate if the Pokemon in last place is the same species or is fainted.
The effect is aesthetic only; Illusion does not change the Pokemon's type or moves, so for example a Fighting-type move against a Zoroark disguised as Gengar would still be super effective. Any direct attack (i.e. not entry hazards, weather conditions etc) will
break the illusion.
|Generation V||Comes out disguised as the Pokémon in back.|
No Pokemon have Illusion as a hidden ability in Pokemon Black & White.
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