Stealth Rock (move)

Stealth Rock is a non-damaging Rock-type move.

Effect
Stealth Rock sets an entry hazard around the target Pokémon. Pokémon on the target's field receive damage upon switching in. The amount of damage inflicted upon switching in is affected by the effectiveness of  against the target. It also does not stack if multiple layers are set. It does not damage Pokémon with the Ability . removes Steath Rock from the user's side of the field if it affects its target;  clears the Stealth Rock from both sides.

The damage is taken from the victim's maximum HP, and follows: