There is no chao in generations.....
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sonic generations,or both!
To make a Chaos Chao you have to reincarnate your Chao at least twice. After that, give it 1 of each out of all 21 animals (Note: Do not give them Chaos Drives!). Yes, you can feed your Chao too. If you want it to be an Angel Chaos Chao, raise it with any Hero character: Sonic, Tails, or Knuckles. If you want it to be a Devil Chaos Chao, raise it with any Dark character: Shadow, Eggman, or Rouge. If you want it to be a Light Chao, raise it with a mixture between the Hero and Dark characters and keep it Neutral. When it evolves, it should be a Chaos Chao. Hope that helped! :]
According to Sonic the Comic when Perfect Chaos attacks Sonic he absorbs the Chaos energy!
you have to go to the shop and go to skill set and get the chaos emeralds and activate it then you use 50 rings [to do it you need beat the game]
Sonic Generations.