Rock Headin Pokémon Polished Crystal

Rock Head is an ability that prevents the Pokémon from taking recoil damage from moves that normally cause it. This means that if a Pokémon with Rock Head uses a move like Double-Edge or Brave Bird, it will not take any recoil damage from those moves. This ability is particularly useful for Pokémon that rely on powerful recoil moves, as it allows them to use these moves without the drawback of losing HP from recoil.