1. Gold, First go to the place where you first fought Chaos 0 you should see a egg shaped rock, Pick it up. Then go to the antique store,
and take the gold egg off the pedestal and put the rock on it.
2. Silver, Go to the Mystic Ruins Waterfall, you should see a boat near the water, touch it and you will see an egg fall from the waterfall.
3. Onyx, In the middle prison cell on the Egg Carrier.