Regenerator

 is a Pokémon ability introduced in the fifth generation. It recovers the health of the Pokémon when it is switched out.

Description
When a Pokémon with Regenerator is switched out, 1/3 of their health is recovered. When a Pokémon gains the ability through Trace and similar, it will regain the health upon switching out if it isn't suppressed beforehand. Heal Block does not prevent healing from this ability.

Pokémon with Ability

 * Audino
 * Mienfoo
 * Mienshao
 * Tornadus Therian Forme

As a Hidden Ability

 * Slowpoke
 * Slowbro
 * Tangela
 * Slowking
 * Corsola
 * Ho-Oh
 * Tangrowth
 * Solosis
 * Duosion
 * Reuniclus
 * Foongus
 * Amoonguss
 * Alomomola
 * Mareanie
 * Toxapex