Yes, you can give your Chao Chaos Drives before it reincarnates twice. Whatever you do BEFORE its second reincarnation doesn't effect the "Chaos Chao life". However, in its second reincarnation, you can't give it Chaos Drives or it won't work. You just need to give it one of each 21 animals. Hope I helped! :]
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It takes about 3-5 hours for a chao to reincarnate, so it would take 6-10 hours for it to reincarnate twice. This is taken from the game Sonic Adventure 2 Battle.
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! :]
After your chao has reincarnated twice or more, give it EVERY ANIMAL IN THE GAME and NO CHAOS DRIVES. All of the animals are: PenguinOtterSealPeacockCondorParrotBoarRabbitCheetahTigerGorillaBearSkunkRamRaccoonUnicornDragonPheonixBatSea MonsterSkeleton DogI recommend making a check-list so that you ensure that it works. If you have any difficulties in making a chaos chao, feel free to message me as I have some chaos chao (eight to be exact) so I should be able to help. - Raiwolf
Give any chao it's OWN broken egg shell after giving the chao a few skelaton dogs and it will put it on. Now reincarnate the chao twice with the shell on the whole time and after the second reincarnation, it will be a full egg chao(I think). A lot of people say you can only do it with some sort of cheat but I'm pretty sure what I just said works. Good luck. I am actually trying it right now.
It's been a while since I've played this, but I'll give this a shot: # Playing as Sonic, collect the 7 Chaos Emeralds (to get a Chaos Emerald, find the large gold ring hidden in one of the acts. You'll be warped to the secret stage, where you'll have to collect all the blue spheres and avoid the red ones. Once you do this, you'll be given a Chaos Emerald! Only 6 more to go!) # Once you do have all 7 Chaos Emeralds, collect 50 small rings. # Once you have them, press the jump button twice. # Instead of using the split-second shield, Sonic will transform into Super Sonic.