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It is used for the Find The lost Chao missions.
Usually, you find the Lost Chaos where you do Mystic Melody or whatever it is (You know, where you play the flute at the 'old ruins' like sonic says). You play the flute and go on the obstacles and you see a chao!!! But if you get the chao, it does NOT go to your Chao Garden.
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I believe sonic and tails can get bears in final rush for sonic for tails im not sure.
it doesn't exist
Ebay
you can find them in Pumpkin hill
You might be able to find the cartridge on ebay.
yes you can find it in many levels
Aquatic Mine and Iron Gate
Actually there is a way to hack sonic adventure 2 battle and play as super sonic in normal levels just look around the internet and im sure you will find your answer.
no. you go to twinkle park when your playing as sonic in his story mode when Amy get's lost