Gold Chao

In Sonic DX: Director's Cut, if you go to the store where you see a golden egg, first go down to the lawn/garden area, then you will see a rock. Pick it up and bring it to the store. Take the golden egg, and then the you'll be locked in. Put down the golden egg, and pick up the rock. Place it on the place where the golden egg was. You can now take the golden egg to the Chao Garden.