Instructions
Go to the "Chao Garden" and pick up a spotted egg by pressing the "B" button while standing in front of it.
Move the analogue stick back and forth to shake the egg until it hatches a chao.
Pick up the chao by pressing the "B" button while standing in front of it. Put the chao back down by pressing the "B" button. Move the analogue stick while standing in front of the chao to pet it. Keep petting him until he turns completely black and the heart over him turns pink.
Feed the black chao green chaos drives until its "Run" level is 8.
Pet the black chao and feed him fruits every 30 minutes of time spent in the "Chao Garden." After three to four hours in the "Chao Garden," the chao will be ready to evolve.
Find the chao and pick it up, then set it down and wait while a blue-green teardrop-shaped shell forms around it. The chao will then evolve into a "Shadow Chao."