Right now I'd only count Charizard, Gyarados, Dragonite, Salamence, and Rayquaza as fitting that bill.
what about druggigon and that 3 headed hydra thing?
My bad, I forgot Druddigon (I'll edit it in). I couldn't include Hydreigon because its partly based on a hydra, even though it does look like a stereotypical dragon for the most part.
It's not based on the hydra. It's based on Yamata no Orochi.
Which is...more or less....a.......?
Isn't Orochi a demon? So that makes Hydreigon...a demonic hydra that can fly.
Fun fact about Hydreigon's wings: Even though it is based off of Orochi, GF didn't want to clutter the design by literally adding more heads. Instead, they opted for giving Hydreigon those small strip-like wings, which they've stated that if you look at it's shadow, the wings make it look like it has more heads
Official hot fudge sundae of the IDF Official Hydreigon of the Pokemon B/W 2 Boards.