How do you get an egg chao in sonic adventure battle 2

There is no "egg chao" in SAB2, but you can put eggs on an already born chaos. You chao has to be somewhat smart, and you have to be very persistent, but if you keep handing an eggshell or unhatched egg (murder!) to a chao, it will eventually figure out it can put it on it's head, which it will do itself. This effect is permanent and the egg cannot be switched out afterwards, so make sure the egg/eggshell given is a cool one!