Generation Iii
Rough Skin
Hurts to touch.
Detailed Effect
Whenever a move makes contact with this Pokémon, the move's user takes 1/8 of its maximum HP in damage. This ability functions identically to Iron Barbs.
Pokémon With Rough Skin
6 canonical Pokémon forms can have this Ability.
Carvanha 
Sharpedo 
Druddigon 
Gible 
Gabite 
Garchomp