Liquid Ooze

Damages opponents using leeching moves for as much as they would heal.

Full effect

Whenever a Pokémon would heal after hitting this Pokémon with a leeching move like Absorb, it instead loses as many HP as it would usually gain. Dream Eater is unaffected.

In game description

The strong stench of the Pokémon's oozed liquid damages attackers that use HP-draining moves.

Pokemon with Liquid Ooze

Using Liquid Ooze in Cobblemon

Abilities are passive and always active, so Liquid Ooze 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.