you can't download it
you have to have a gameboy advance with sonic advance 1 or 2 and you transfer your chao in the tiny chao garden on the gameboy advance using a cable(i don't remember wath sort of cable) NOTE:Works only on the GC version
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Use action replay
Use action replay
Chao can be obtained in either Sonic Adventure or Sonic Adventure 2. To get one simply find the Chao garden in that particular game. In Sonic Adventure you just go into the hotel in Station Square and go up the left elevator. This will bring you to the Station Square Chao garden. The first time you enter, there will be two chao eggs inside. To hatch them press X or B to grab them and to hold them for a while and let go. The egg will hatch and a chao will come out! Congrats you now have your first chao! In Sonic Adventure 2 simply find a chao box in a stage (its a blue box), open it and grab the key. Then finish the stage you're on and you will warp to the Chao garden. Go inside the garden and follow the same procedure described above.
Trust me, there isn't a way other then to stay in the chao garden.
sonic chronicles has a chao garden, but it's not as good as the sonic adv 2 on the GCN chao garden