Reshiram

Reshiram, the White Yang Pokémon, is one of the two major Legendary Pokémon of Pokémon Black and White and the version mascot of Black; its counterpart is Zekrom. N claims that capturing one of them will make him Unova's hero; he captures Reshiram in White, while in Black Reshiram appears before the player, who must catch it before challenging N. Its name and design were revealed on 28 May 2010.