Perish Bodyin Pokémon Polished Crystal

Perish Body is an ability that causes any Pokémon that makes contact with the user to faint after three turns. When a Pokémon with Perish Body is hit by a physical move, both the user and the attacker are affected by the Perish Song effect, which counts down from three to zero. Once the countdown reaches zero, both Pokémon will faint.