Is there any sort of musical or other type of cue that your Choa has completed it's second evolution? I'm trying to create a sonic type choa, but every time I think it's finished it's evolution and I start giving it other types of drives and animals it starts to change back (Quills get shorter, ect). Will this happen even after it's finished it's second evolution?
There is no real indication to signify the end of the second evolution, but it tends to stop around age four. However, if you want to raise your chao's stats without changing its second-evolution shape before then, use animals rather than chaos drives.

~ Crazy C Lea