It's just a matter of picking the right Pokémon for each type. My only fire types right now are my Charizard and Growlithe, for one. And if you think that's bad, my only normal type is part flying. Of course, it'd help if there were more competent normals out there. Most are just... decent.

But dragons are definitely one of the best types out there. I'm only missing a few myself. Salamence, Kingdra, Flygon and Druddigon.