Golden Chao
If you want a Golden Chao, you will need your Chao to mate. First, buy a Brown Egg for 800 Rings at the Black Market, and a Shiny Yellow Egg for 5,000 Rings. Treat them nicely, and after they're 1 year of age (check it at the Doctor in the Chao Kindergarten), buy two Fertility Fruits at the Black Market for 300 Rings each. Feed one to each, a ring of flowers should circle them, if a chao is naive, you will have a better chance of them mating, now, stick one or the other in the other chao's ring, then, they will mate, and have a baby. Open the egg, and you should have a golden chao.
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