Zekrom resembles a large mechanical-seeming dragon, it is bipedal and mostly black/dark gray in coloration. Parts of its body regularly glow blue as electricity is generated. It has a bulky appearance, in contrast to the appearance of Reshiram. Its most notable feature if the large generator embedded in its tail. On the back of its head is a strange crest that may be based on thunderclouds.
Zekrom is one of the Legendary Pokémon spoken of in the Unova region's legends. Originally it was part of a single dragon along with Reshiram but split into the two dragons. It and Reshiram apparently share history with Kyurem. Zekrom represents Black Yin and is a Pokémon that prefers strong ideals.When not resting in the form of the Dark Stone, Zekrom can be found flying the world's skies, wreathed in black clouds.