Ok here is my first two.
Victini@Leftovers
Nature: Timid
Role: Sweeper
Ability:Victory Star
Flame-burst:STAB hurts both opponents(I was considering searing shot but Darkrai isn't bulky enough)
Psychic: STAB
Thunder: Coverage + Darkrai's Ice beam=BOLT BEAM coverage it is also good for destroy Kyogre
Shadow-ball: Coverage
Darkrai@focus sash
Nature: Timid
Role: Sleep Sweeper
Ability: Bad Dreams
Dark-void: Perfect acc thanks to Victini
Dream-eater: Healing
Dark-pulse: STAB
Ice-beam: Coverage
These Pokemon are a great pair Victini's Coverage paired with Darkrai's Coverage and Sleep are an amazing pair.
Kyogre@leftovers
Nature: Timid
Role: Bulky Sweeper
Ability: Drizzle
Water-spout: Hits all enemies in one strong move
Thunder: Coverage
Ice-beam: Coverage
Thunder-wave: A nice little surprise for Mewtwo
Zekrom@Air balloon
Nature: Jolly
Role: Bulky Sweeper
Ability: Terravoltage
Bolt-strike: STAB
Hone-Claws: +attack and Acc for Bolt-strike
Dragon-claw: Reliable stab
Stone-edge: Coverage
Another Bolt beam combo duo with amazing coverage and Power.
Raquaza@Yache berry
Nature: Jolly
Role: Sweeper
Ability: Air lock
Dragon-Claw: STAB
Crunch: Coverage
Extreme speed: Priority
Brick-break: Coverage
Deoxysis(attack form)@Focus sash
Nature: Jolly
Role: Sweeper
Ability: Pressure
Ice punch: Coverage
Fire punch: Coverage
Thunder punch: Coverage
Brick-Break: Coverage
The last 2 were basically just last chance Pokemon to sweep away whatever is left. Please any suggestions are helpful.