How to get a rainbow chao.
1.First Hatch a Regular egg (Throw it at a wall)
2.Raise it with a dark character
3.Give it red chaos drives.
4.Feed it normal fruits from the trees.
Soon it will go into a cacoon and come out as a rainbow chao
If you go to chao karate and go on expert you will see rainbow in round 4.
Nice Job You Got A Rainbow Chao.
Note:This cheat isn't fake because I have a rainbow chao.
If you need more help, we've got more Sonic Adventure 2 Battle cheats and also check out all of the answers for this game
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