Gardens
The Chao Garden is the first garden you start off with to raise chao. In the picture of the Chao Garden, there is a dark hole which is a cave. Go in it, and you have access to let one of your chao compete in Chao Karate or even in a Chao Race!
The Hero Garden is where people usually raise their Hero chao. You can unlock it by making a regular chao, a Hero Chao! This is one of the two unlockable chao gardens in the game, Sonic Adventure 2 Battle.
The Dark Garden is where people usually raise Dark Chao. You can unlock it by making a regular chao, a Dark Chao! This is one of the two unlockable chao gardens in the game, Sonic Adventure 2 Battle.
