Xerneas. Item is kings rock.
Geomancy
Moonblast
Megahorn
Thunderwave

Gogoat. Item is meadow plate.
Bulk up
Leaf blade
Synthesis
Earthquake

Tyranitar. Holding a tyranitarite.
Crunch
Stone edge
Surf
Earthquake

Tyrantrum. Holding a dragon fang.
Crunch
Draco meteor
Earthquake
Head smash

Zapdos. Holding a zap plate.
Thunderwave
Thunderbolt
Drill peck
Agility

Snorlax. Holding a rocky helmet.
Belly drum
Giga impact
Rest
Substitute

Any help would be great as I have yet to test this team online..