Zekrom's tail consists of large, round, conical and spiked formation, likened to an electricity generator, with a black inner portion and bands on the tip of the outside portion. This tail produces energy for its attacks and emits an anti-gravity field, allowing Zekrom to fly through the air with minimal effects from aerodynamic resistance and gravity. It can cause several thunderstorms in one area, and it normally hides in thunderclouds.
Zekrom is a black, bipedal Pokémon resembling a dragon or dinosaur, with dark patches on various portions of its body. It has red scleras, white irises, and black pupils, as well as a small horn-like protrusion on the tip of its snout. Its head sports a thundercloud-like crest tipped with light-blue coloration. There are six pairs of pointed teeth visible when its mouth is open, two in the upper jaw and four in the lower.