What was that Sonic Video game?

Question

where you could raise your own creature?

Answer 1

If your talking about the Chaos, its

Sonic Adventure 2 Battle

Thats the only game Where u can raise chaos, or the creatures ur talkinga bout

U can also do it in

Sonic DX directors cut

But its very bad graphics and bad to raise chaos.

Sonic adventure 2 battle u can feed them, use them in contest, its a lot of fun, play and seee =D