Supreme Dirt's uber Strategy - Double Battle

[Supreme Dirt]

Well, I notice that people don't really take double battling all that seriously here, so here is a team specifically designed for it, in ubers.

Leads:
Heatran@Choice Specs
Modest
252 Sp Atk 252 Spd 6 Def
Lava Plume
Earth Power
Flash Cannon
Dark Pulse

You don't normally see Heatran in ubers, but you will soon find out why...

Latias@Soul Dew/Leftovers/Chesto Berry?
Psychic
Calm Mind
Rest
Skill Swap

First round, I swap Levitate over to Heatran, immunizing it to ground. And now I can Lava Plume away, without hurting Latias.

Groudon@Choice Band (I'm addicted to choice items lately)
Shadow Claw
Earthquake
ThunderPunch
Stone Edge

Rather simple. Only problem would be Darkrai, or an enemy Groudon.

Mew@??? (What should I use?)
Synthesis/Softboiled (Synthesis after I get it from Pokemon Ranch)
Amnesia
Barrier
Baton Pass

Cresselia@???
Toxic
Lunar Dance
Moonlight
Protect

This is a late game combo. Basically, when Mewtwo or Groudon are weak, out comes Mew, who BPs boosted Defenses to Cresselia, who simply tries to Poion everything. Then alternate between Protect and Moonlight to stall. When Moonlight runs out, 1 more Protect, a Lunar Dance, and out pops either Mewtwo or Groudon, fully restored and ready to sweep.

Mewtwo @ Life Orb
Aura Sphere
Thunderbolt
Shadow Ball
Ice Beam

Not much to say about this.

So? Any suggestions?

Natures and EV spreads would be nice as well.
And that Cresselia is staying. It works quite nicely.