Okay first off I know this cheat is true because I have a rainbow chao.
1st take a normal egg and hatch it(dont throw it up against a wall, press and hold the b button then hold the analog stick in what ever direction) with a dark character
2nd make it a dark power chao and give it the power chaos drives( I don't know if the power animals work) and nuts that grow in the chao garden only
3rd wait until it evolves(again hatch it) and you have a rainbow chao ^_^
Added by: shadowfan2014 Dec 6th 2009, ID#8970