I'm not so sure that's dragon scaling. Just looks white to me.. doesn't have the thickness that dragons have. Could be from a dragon spawn I guess.
He's a marble HMPK... the popular name for that color scheme is "Koi" but that's just a made up name. Very nice wide webbing on his caudal fin but his anal is confused.. not sure if it wants to be symmetrical or asymmetrical.
*Be smart.. Do your research!!*