If I want to make an all dragons team in X/Y, what are my best bets?

I haven't played a Pokémon game since Silver and I have no idea what's good/badnor do I really care, just don't wanna get niggerstomped as far as individual pokés and their movesets go.

I'm also perfectly fine with throwing in bros like Tyranitar because they're cool enough to count as dragons.

So far I've got Vibrava, Garchomp, Tyrantrum, Goomy, Bagon, and a Pupitar.