The Legendary Dragon Pokemon

I was looking at black and white Kyurem, and was wondering, what did the original dragon pokemon of legend look like? I followed a bit of the logic in black and white Kyurem anatomy, sticking the pieces of Zekrom or Reshiram where Black Kyu/White Kyu was lacking them, and leaving the whole thing in greyscale because Kyurem was what was left of the original body. I also decided to make the glow yellow, because
(a) It would match Kyurem's forehead crystal/gem/whatever, and
(b) Red and blue are the other primary colors and were already used as glows.
I thought about using a chill ice blue, but I didn't believe that the original dragon would still be an ice type with all its parts. I'm settled with believing it is pure dragon type.

So yeah. This design purely follows what was presented in the Pokemons' designs. It would look a lot different if I had designed it based on what looked cool.

Hopefully you enjoy this doodle.