To get almost unlimited gold chao,you need a memory card,the game disk(duh),controller,and a gamecube.that is all.
1)go to the city hall place(near brown doors)and there should be an egg looking rock.pick it up and go to the antiques store.there is a gold chao egg there as an atique.If you pick up the gold egg,an alarm will activate.this is where the rock comes in handy
2)pick up the gold egg and replace where the egg was with the rock.then,u can leave.
3)now that you have deactivated the alarm,go to the chao garden(hotel's first elevator)and set it down,throw it,or shake it to open the egg.then you have your golden chao.
4)then turn off the game and create a new file,and repeat the proccess.then you should have another golden chao.i did this cheat and already got 4 gold chao(just started).this should also work with e-102 gamma's file for getting the black egg.i havent tried yet though....good luck and tell me if it works.