I used Pokebank to transfer my Reshiram and Zekrom from Pokemon White 2 over to Pokemon X version awhile ago. It's helpful to use the 3D models as references. I got a bit wrong, but it's mostly a coloring test of mine.
So I used
's color tutorial seen here ( purplekecleon.deviantart.com/a…
) I think just by using those and going off on my own, I did pretty good. Cept the background. I suck with that.