Guard Dog
Boosts Attack if intimidated, and prevents being forced to switch out.
Full effect
Boosts the Pokémon’s Attack stat if intimidated. Moves and items that would force the Pokémon to switch out also fail to work.
In game description
Boosts the Pokémon’s Attack stat if intimidated. Moves and items that would force the Pokémon to switch out also fail to work.
Pokemon with Guard Dog
Using Guard Dog in Cobblemon
Abilities are passive and always active, so Guard Dog 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.