Nothing happens, Pokemon isn't real, this is a dream mate.
I think some of the evolution lines kind of got mixed up too. Bagon is a BABY DRAGON who dreams of flying, Sheglon is a shell like dragon waiting to evolve to fly, and then it evolves into...Salamence?? I think the Flygon and Salamence lines got mixed up somehow.
So, Bagon changes from blue to green?
Seriously this is as ;083; as the theory that Venonat was suppose to evolve into Butterfree.
Belgon, Shelgon, Flygon doesn't at least make a little bit of sense?
I wish Nintendo of America had chosen different English names for Bagon/Shellgon; then we wouldn't constantly get people going "lol, Look how similar Bagon and Flygon's names are; I think they got the lines mixed up! " >_>
Belgon, Shelgon, Flygon doesn't at least make a little bit of sense?