This move effect may be in need of research. Reason:How does Perish Body behave when struck by a move that forces a switch, such as U-Turn (user) or Dragon Tail (target)? You can discuss this on the talk page.
When the Pokémon with Perish Body is hit with a contact move, both the attacker and the Pokémon with Perish Body will faint in three turns. If the attacker already has a perish count or is wearing Protective Pads or has Long Reach, the Ability does not affect anyone.