Hurts foes when they switch in.
Spikes is a Ground-type status move that sets a layer of spikes on the opponent's side of the field. When an opposing Pokémon switches in, it takes damage based on the number of layers of spikes present (up to three layers). In Polished Crystal, Spikes can be learned by various Pokémon, providing them with a strategic option to chip away at opponents' health as they enter the battle.