Liquid Voice
Sound-based moves become Water-type.
Full effect
When this Pokémon uses a move that is sound-based, that move's type is Water.
In game description
Sound-based moves become Water-type moves.
Pokemon with Liquid Voice
Using Liquid Voice in Cobblemon
Abilities are passive and always active, so Liquid Voice 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.