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When the wielder leaves the field (whether by manual switching or moves such as Roar), it heals 1/3 of its max HP.
Incredibly powerful, especially on bulky Pokemon such as Slowbro and Reuniclus. Sometimes the alternative option will be more favorable, but for a defensive team settled down for the long game, Regenerator is an amazing ability to bolster the longevity of your Pokemon. Ho-Oh in particular really appreciates this ability, as it alleviates its 4x weakness to Stealth Rock somewhat, as well as greatly increasing its lifespan in general. Tornadus-T is another notable user, as it can use its incredibly strong STAB Hurricane while recovering any HP it may lose through Stealth Rock simply by switching out, which is made easier by its access to an extremely fast U-turn.
Found in Dream World