Play as a dark character in a chao garden and evolve your chao twice. If you treated him good, he will go back to his egg stage. Re-hatch him and evolve him twice. If he goes back to his egg, hatch him and feed him ALL 21 types of different animals.Once he evolves, feed him a Dark Fruit. He'll instantly evolve into an Ultimate Devil chao. This is the best chao because he will never die and he is super strong and super fast.