Rex Oxidan

The Rex Oxidan or Rex is a strong dinosaur oxidan. He first papered at the end of episode 1 and had a real debut in episode 2. He is powerful enough to knock people back with his roars and was able to survive Tatsuya's Cobalt Kickstart. He was defeated though by Tatsuya's Emerald Omega. He was originally after Zer0 and 0ne until defeated by Tatusya.