Sonic Chao turns blue on it's second evolution.
you kick him
50 or 40
go buy the light blue egg RE:: After 105 emblems.
no codes, just give it only those blue tube things.
get a blue chao and make it a neutral run type
chaos is a blue blob. he was made by dr.eggman.chaos,s first appearance was sonic adventure for the dreamcast.
You would breed a yellow chao and blue chao. Or you could buy a green chao egg from the black market.
Raise a chao in Sonic Adventure 2/Battle so it is speed/speed type. Make it neutral or hero and you should notice that it goes to green, then blue, then finally grows spines. Try giving it a hedgehog as its last animal, to get Sonic's shoes.
There is more to Sonic Chao than the first evolution. First raise your chao to have high speed until it evolves into a green adult chao (Adult Speed Type) and then keep feeding it green chaos drives and no other drives. he will slowly change into a Sonic chao. (This does take a long time to do!)
You need to have a regular chao to get a sonic chao on Sonic Adventure DX. Before your regular chao evolves to a neutral chao, you need to give it a lot of speed. As it evolves to green, give it more speed so it turns blue.
To get an Onyx Chao in Sonic Adventure 2: Battle is to have Sonic Advance 1 or 2 (Tiny Chao Garden) and a GBA link cable to transfer it to the Gamecube. It costs 20,000 rings and it's a little rare. But it can be found at the shop in the Tiny Chao Garden. Hope this helps!
"there is no blue egg there is only ligt blue egg" There IS a blue egg and it's random to each game, I have 49 and still don't have one, my friends has 75 and just got her's and some one I know got it at 105.