Poison Heal is Pokémon ability introduced in the fourth generation as the signature ability of the Breloom family. It recovers health whenever the user is poisoned in battle.
Poison Heal restores 1/8 of the Pokémon's maximum health at the end of each turn instead of taking it. Being badly poisoned is treated the same as regular poison for the effects of the ability but, if the ability is changed for whatever reason, the Pokémon will take the same level of damage as the status's normal output. For example, after being badly poisoned for five turns, it will incur poison damage starting at 5/16 instead of 1/16.