Piercing Drill

Full effect

When the Pokémon uses contact moves, it can hit even targets that are protecting themselves, dealing 1/4 of the damage that the move would otherwise deal. Everything aside from the target's protective effects is still triggered.

In game description

When the Pokémon uses contact moves, it can hit even targets that are protecting themselves, dealing 1/4 of the damage that the move would otherwise deal. Everything aside from the target's protective effects is still triggered.

Using Piercing Drill in Cobblemon

Abilities are passive and always active, so Piercing Drill 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.