In terms of appearance, Zekrom was grayish-black overall.
It looked like a cross between a dinosaur and a muscular, bipedal Western dragon. Most of its body was dark gray, with a few parts bordering on black. A gray, lightning-shaped crest crowned its head, four jet-black armor plates covered its shoulders and legs, and a pair of steel-like wings extended from its shoulders.
Xia You did not know much about this Pokémon. He only remembered that, in mythology, it seemed to be a Legendary Pokémon that burned the world to ashes with lightning and aided those who would create an ideal world.
According to the myths, if humans lost their sense of justice, it would destroy their kingdom with violent thunderbolts.
It was said that its tail contained an enormous generator capable of producing electricity. When the inside of its tail spun like a motor, it could generate several bolts of lightning that pierced everything around it. It normally concealed its entire body within thunderclouds as it flew through the skies of the Unova Region.
The Rotom Pokédex was still on the ground and had not followed them into the sky. Even if it had, however, it could do nothing beyond recording Zekrom.
The battle had scattered the dark clouds surrounding Zekrom, giving Xia You a clear view of this Pokémon at the pinnacle of the Unova Region.
Under his gaze, Mewtwo and Zekrom fought at close quarters, pouring out energy without restraint in midair. At their level, however, attacks could not easily hurt them; they were either dodged or blocked. Though the battle looked incredibly intense, the spectacle was only superficial.
This was also a common problem when these Legendary Pokémon battled. Without human intervention, they often caused an enormous commotion and could fight for days and nights on end