Sigh...
You mean Devil Chaos Chao?
Your Chao has to reincarnate 2 times. On it's third life, give it one of every animal (absolutely NO Chaos Drives!) and raise it with a Dark Character. And there you have it.
*Signature correction
I see and feel the evil
My hands will crush 'em all
You think you have the answers?
I'll laugh and watch you fall
Also max one image in the signature.