If you treat your chao nicely he can live up to 8 years
No, not all chaos do, but it is possible to have a chao evolve so that it resembles Sonic by having it first evolve to a running-type hero chao, then have a second transformation again as running type.
Sonic Advance 1, 2 and 3 (Gameboy Advance) have chao gardens which are small and not very great, but Sonic Adventure (Dreamcast), Sonic Adventure DX (GameCube), Sonic Adventure 2 (Dreamcast), Sonic Adventure 2 Battle (GameCube) all have chao gardens where you can do the most things and raise your chao the best and most effective. Sonic Adventure 2 Battle is the most convinient and shows you all you need to know about a chao, and it's a really good game to raise them in by using animals (and Chaos Drives) as a means of training them. Sonic Advance 1 and 2 can connect up to Sonic Adventure 2 Battle and Sonic Adventure DX via a Gameboy to GameCube link cable and you can exchange chao with.
No, two tone chaos are gained when you breed a normal chao, and a monotone chao (monotone chaos are just one colour, you buy them from the black market)
There is sonic, tails, knuckles, amy, rouge, eggman, shadow, chaos zero, tikal, dark chao, normal chao, metal sonic. So that would be 12 characters.
Yes there are chaos in sonic adventure 2 battle
But you can't before it is
You Can In Sonic Adventure 2 Battle. I Think you can in DX.
Gold chao can only be found in sonic advance for the gameboy advance. Then you put it on sonic adventure battle
Yes.
They don't have to. they live forever.
No? Once a chao has reincarnated twice and reached the state of being a Chaos Chao they simply... never die.
Chaos (from sonic adventure) Is the guardian of the chao.
yes and the lght chao can take them as well
Sonic Adventure 2 for Dreamcast, or Sonic Adventure 2: Battle for Gamecube.
Take your chao to the medical center in the chao kindergarten and see the test results
You do the process to get a sonic chao again or make it reincarnate twice for a CHAOS CHAO!!! - the same as he said, but your chao will be better each tmie it reincarnates because it will keep 10% of its stats !!