Aroma Veil
Protects allies against moves that affect their mental state.
In game description
Protects the Pokémon and its allies from effects that prevent the use of moves.
Pokemon with Aroma Veil
Using Aroma Veil in Cobblemon
Abilities are passive and always active, so Aroma Veil 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.