Rough Skin

 is a Pokémon ability introduced in the third generation. It harms attacks that make contact.

Description
Rough Skin causes the attacking Pokémon to take damage equivalent to 1/8 (1/16 in the third generation) of their maximum HP. If a multistrike move like Fury Swipes make contact, each hit activates the ability. In the case of both the attacker and Pokémon with Rough Skin fainting, the attacker will faint first.

Pokémon Mystery Dungeon
In the Pokémon Mystery Dungeon series, if the attacker is directly in from of the Pokémon with Rough Skin, they lose half of the damage dealt.

Pokémon with Ability

 * Carvanha
 * Sharpedo
 * Druddigon

As a Hidden Ability

 * Gible
 * Gabite
 * Garchomp