Embody Aspect

In game description

The Pokémon's heart fills with memories, causing the Mask to shine and one of the Pokémon's stats to be boosted.

Using Embody Aspect in Cobblemon

Abilities are passive and always active, so Embody Aspect 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.