To get a Chaos Chao you must first have your chao reincarnate twice. Then in its third life while its a child give it one of every 21 kinds of animals. Only one of the same animal and dont give it drives then have the alignment to what you want it to be. For a Hero Chaos Chao make its alignment hero for Nuetral Chaos Chao make its alignment Nuetral. For a Dark Chaos Chao make its alignment dark. Then wait for you chao to evolve and a Chaos chao will come out of the Caccoon
(OPTIONAL: Get a blue/sapphire/aquamarine colored chao to make it look like
Chaos zero!!