Chaos chao: have a chao reincarnate at least twice so it's on its third life or more. In the baby stage, give it one (and only one) of each of the 21 animals, and absolutely no chaos drives, and then turn it to whatever alignment you want (Dark Chaos chao = Devil, Hero Chaos chao = Angel, Neutral Chaos chao = Light). When it evolves it should become a Chaos chao, although it seems there's a small fail rate. This is for SA2B.
~ Crazy C Lea