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I like Flygon the most.
Maybe it's just me, but when I'm using Flygon, I forget that it's dragon/ground, and that it's not dragon/flying. Its Levitate ability almost makes it feel like Flygon's 3 types.
Kingdra, since it's the only Dragon not weak to Ice attacks. Here's a bit of useless information for you: The only dual dragon that wouldn't suffer super effective hits of other dragon Pokemon would be a Steel/Dragon. That would be so cool as well XD