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Hydreigon@Leftovers
Levitate
Mild Nature (252 attack, 252 speed, 4 attack)
Outrage
Crunch
Super Power
Earthquake
Considering that Draco Meteor is gone and Outrage and Crunch are now special moves, this is probably what his set would be. He'd probably go back to his mixed wall-breaking roots in gen 3. Luckily he still gets Superpower and Earthquake, two other great coverage moves.
He'd probably do a lot better considering Brick Break is the most commonly used fighting move in Gen 3, and would probably be a more commonly used dragon, maybe up there with Salamence. I'd put him in OU for sure at least.