Cartoons!
Atyroki
Zantimonius
CyzirVisheen
Not to say that the others aren't great, no on the contrary, the sheer amount of awesomeness surprises me every time. However, these are the ones that jump out, IMO.
Cartoons! For just being brilliant and having a lot of character to it. Something that makes a work of art feel much more alive. As well as a daring trip to another less-explored side of the dragon, with excellent results.
Atyroki and CyzirVisheen have done excellent work also, with daring and different designs. While Atyroki went for a body-structure similar to that of Tropius and Meganium, something completely valid in the pokémon world, he still managed to make his design of CAP8 stand out. Cyzir's three-headed cloud... It's just brilliant and I am glad the artist has listened to the suggestions. The large body/cloud itself represents the bulk better than any other IMO. Although, truth to be told, that doesn't say much because a lot of designs do this really well.
Zantimonius... That's just brilliant. All I can give you. Maybe it looks a little mechanical, maybe the perspective is a bit hard to sprite from, but that design is undeniably brilliant. Outright brilliant.
Also I'm biased against stereotypical dragons.