The Ring glitch/cheat!
Ok first in the chao world go to the Black Market and buy an expensive item. Then go into one of your gardens and drop it of. After that save the game and come back. Sell the item and reset (button on gamecube that is PLAIN purple no impressions and words that say "Reset") then go back to the same garden and the item should be there. But you still have the rings from the sold item! Do this as MANY times as you want and you'll be rich!
More tricks, tips and cheats for this game are right here - Sonic Adventure 2 Battle cheats
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