Mixed Bulkyish Zekrom
EVs: 252 Spe, 176 HP, 80 SpA
Item: Life Orb/Leftovers
Bolt Strike: Great STAB move for Zekrom, absolute demolishes Ho-Oh, Kyorge and co on their weaker physical defence.
Outrage/Draco Meteor: Another great STAB choice for Zekrom, Outrage for hitting the likes of Chansey, Blissey and others on their weaker physical defence, Draco Meteor for hitting the likes of Groudon harder on their weaker special defence.
Earth Power/Focus Blast/Hidden Power (Fire): Earth Power to hit the likes of Heatran, Dialga, and other Steel types hard. Focus Blast to handle Ferrothorn and Tyranitar as well as the likes of Heatran and Dialga. Hidden Power Fire to hit Ferrothorn, Scizor and some other Steel types harder than the aforementioned moves.
Roost: Helps keep Zekrom healthy, especially when using Life Orb as your preferred item.