I now in Sonic Adventure 2 battle you can get out side of the choa garden. Is there a way of getting outside of anyother garden? Also, is there other gardens then the hero and dark? I heard theres a level bewond choas choa what is it and how do you get it.
1. Unless you mean the Chao Lobby, no. Glitches don't count.
2. No, there are only three gardens (Hero, Neutral and Dark).
3. There isn't a "higher" chao evolution beyond Chaos.

~ Crazy C Lea