Zekrom

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