1.)After you beat the game as Sonic and get the Metallic (Silver) Chao Baby, head towards where you faught Chaos 0 (At the beginning of the game.)

2.)When you enter the park where you fought him, go left.

3.)You will find a stone egg - it doesn't even hatch in a sanctuary.

4.)Pick it up and go out of the park and onto the street.

5.)Go left and forward until you find heavy metal doors.

6.)Go in and put the egg down. Pick up the golden egg and put down away from the platform. The doors will lock.

7.)Put the stone egg on the platform where the other egg was and the doors will unlock.

8.) Bring the gold egg to the nearest sanctuary and throw it to hatch it. A Golden Chao Baby will emerge!