First, hatch a normal (spotted egg) with Shadow. Next, give the Chao chaos drives with Shadow only. It will turn brownish-black (probably). Then, when you increase the Chao's stamina to level 9-12, it will eventually evolve. Finally, continue giving it chaos drives until it turns black and red (this may take a while). When done, it will be black and blood red, and 2 spikes that go down and 1 that stays up, and the ears will 70% resemble Shadow. Your Chao is done! You now have a Shadow Chao! Go to my profile and I'll tell you all help about Chao.