Stealth Rock is a Rock-type move that sets the Stealth Rock entry hazard on the target's side of the field. When a Pokémon from the target's side switches in, it will take damage relative to how weak or resistant the Pokémon is to Rock-type attacks, with a base damage of 12.5% of the Pokémon's HP.
Stealth Rock's damage related to the type effectiveness of Rock-type moves on the Pokémon is shown below:
Effectiveness
|
Damage
|
¼×
|
3.125%
|
½×
|
6.25%
|
1×
|
12.5%
|
2×
|
25%
|
4×
|
50%
|
Rapid Spin can remove the entry hazard from the user's side of the field, while Defog removes the entry hazard from both sides of the field.
Learnset
By level