Healer
Has a 30% chance of curing each adjacent ally of any major status ailment after each turn.
Full effect
Friendly Pokémon next to this Pokémon in double and triple battles each have a 30% chance of being cured of any major status ailment after each turn.
In game description
Sometimes cures the status conditions of the Pokémon's allies.
Pokemon with Healer
Using Healer in Cobblemon
Abilities are passive and always active, so Healer 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.