Illusion

Illusion is an Ability that causes the Pokémon to disguise itself as the last Pokémon in the player's party, copying its appearance, nickname, and gender. All other aspects, including stats, type, level, Ability, and moves, are not copied. The disguise will be revealed if the Pokémon is directly damaged by an attacking move. If the Pokémon with Illusion is the last Pokémon in the player's party, nothing will occur.