you need a gamecube with sonic adventure 2: battle. turn on your gamecube, go to stage select, then chao world. now turn on your gameboy adv. and aswell go to chao world. go to that ittle game boy adv. in the gameboy chao world and go to pick up. you can take the chao, the egg, or all your money. i'd rather not do the money if i were you.