Water Compaction
Raises this Pokémon's Defense by two stages when it's hit by a Water move.
In game description
Boosts the Defense stat sharply when the Pokémon is hit by a Water-type move.
Pokemon with Water Compaction
Using Water Compaction in Cobblemon
Abilities are passive and always active, so Water Compaction 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.