When a Pokémon with this Ability is hit by a move that makes contact, the attacking Pokémon takes damage equal to 1/8 of its own maximum HP. If Iron Barbs causes both the Pokémon with this Ability and the attacking Pokémon to faint, then the attacking Pokémon will faint first.
If a Pokémon with this Ability is hit by a multi-strike move that makes contact (such as Fury Swipes), each hit will activate this Ability.
When a Pokémon with this Ability is hit by a move that makes contact, the attacking Pokémon takes damage equal to 1/10 of its own maximum HP. If a Pokémon with this Ability is hit by a multi-strike move that makes contact (such as Fury Swipes), each hit will activate this Ability. The Ability does not activate if the move causes the Pokémon with Iron Barbs to faint.