Since the GBA can interface with the Gamecube, there are a few interesting potential things that can be done. One that interests me is the linking of Sonic Advance 1/2 with Sonic Adventure DX/2. Why? So the Chao can be raised on the handheld. What for? The 100% run.
Here's what I know about the Tiny Chao Garden:
Each fruit changes the Chao's stats.
The Apple should be (ab)used to lower the belly stat, while increasing almost all other stats (except for stamina).
When a Chao's happiness is low, it will threaten to leave. Unless it's happiness gets increased, it will leave.
Once a stat levels up, it can not be lowered. All fruits can be purchased with Rings which can obtained by playing the main game, or the mini games.
When TAS does Quake 1, SDA will declare war.
The Prince doth arrive he doth please.
