Regeneratorin Pokémon Polished Crystal

Regenerator is an ability that restores a portion of the Pokémon's HP when it switches out of battle. Specifically, it heals 1/3 of the Pokémon's maximum HP upon switching out. This ability is particularly useful for Pokémon that frequently switch in and out of battle, as it allows them to recover health without using healing items or moves. This can help maintain their longevity in battles and make them more resilient against opponents.