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.
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A "Blitz" Chao is a Two-Tone White Chao. You can get this Chao by breeding a White Mono-Tone with a Normal Chao.
Your chao will age faster if you spend more time in the Chao Garden with your chao.
If you breed a gold and silver chao, you can get * a Gold chao * a Silver chao * a Gold chao with silver highlights * Or a Silver chao with gold highlights If you didn't get any of these, somethings wrong with your gamecube/dreamcast
Either get a two tone grey chao and make him a shadow chao or a two tone blue or sky blue chao and make either of them a shadow chao or a two tone black chao.
There is no chao in generations.....