Supplies: Knuckles, Pumpkin Hill, ghost dogs. First of all, go to Pumpkin Hill with Knuckles. Ride the rocket up to Church Mountain and get the ghost dog. Then, get the Chao Key and finish the level. When you're in Chao Garden, crack open an egg and give the chao inside the ghost dog. When the ghost dog and chao touch, the chao's legs should dissapear. If not, keep trying. Then, keep petting it with any good guy(Sonic, Knuckles, Tails). When it evolves, it will look just like a ghost!