Naoki

No dragon is able to fly like Naoki. He may not be the fastest, but his ability to weave his flexible body in incredible ways makes him one of the best flyers out there. Now, on its own, this would be pretty good, but his unique ability to adjust the way his scales refract light is what makes him a deadly and formidable foe. He can surround enemies and fly in complex patterns while refracting light off of his scales in a way that completely confuses or even blinds them. Then, while they're incapacitated, he flies towards them and cuts them up with his claws. The only one immune to his light abilities is Zephyrus, since he can't really see different levels of brightness and complex color changes, the two things that make Naoki's deadly strategy work. Even then, he can still hold his own against Zephyrus, as well as Smolder and even Mora. He is a powerful and skilled dragon who is not to be underestimated.