Is average at best. This said, I use him in a team just for fun with friends and sometimes in PvP.
I run a simple Choice Band Set with Jolly Nature, very intuitive, Dragon Claw, EQ, Superpower and U-Turn.
Having a hard-hitting Fighting-Type Attack is pretty useful against things like Ferrothorn and Normal Types and U-Turn for scout. Is nice being able to throw Bulldoze/Earthquake and or Discharge just by switching in and resisting both Rock Slide and Heat Wave is nice too.
If you want to hit hard and safely, just use Garchomp, but if you want to play with switchs and such, and being able to scout, you can give Flygon a try. But is overall outclassed by almost every offensive Dragon (Yes, including Kingdra)