Can you trade a Mewtwo in Pokemon XD: Gale of Darkness? It's the ultimate Pokemon that can never be defeated says Giovanni, leader of Viridian City that existed in Pokemon LeafGreen/FireRed. I always wanted to battle people with my legendary pokemon. They're so cool. Plus, I traded my Level 100 Jirachi sucessfully to Pokemon XD: Gale of Darkness. Jirachi is not an illegal pokemon!