Thundurus

Thundurus (Japanese: ボルトロス Voltolos) is a dual-type Electric/Flying Legendary Pokémon introduced in Generation V.

While it is not known to evolve into or from any Pokémon, it has a second Forme activated by using the Reveal Glass. Its original Forme, Incarnate Forme, will then become Therian Forme.

Its Therian Forme was officially revealed May 12, 2012.

Along with Tornadus and Landorus, it is a part of the Forces of Nature.