Shed Skin
Has a 33% chance of curing any major status ailment after each turn.
Full effect
After each turn, this Pokémon has a 33% of being cured of any major status ailment.
In game description
The Pokémon may cure its own status conditions by shedding its skin.
Pokemon with Shed Skin
Using Shed Skin in Cobblemon
Abilities are passive and always active, so Shed Skin costs you nothing to run. If it is marked hidden on a species above, expect it to be harder to obtain: servers differ in whether hidden abilities come from breeding, an Ability Patch, or events.
See the Pokedex for which abilities each species can have, and IVs, EVs and breeding for how to actually pass one down.