[CaRdIaC]

The best team:

Mewtwo
Psychic
Future Sight (Calm Mind)
Recover
Ice Beam ( Thunder)

Dragonite
Outrage
Thunder (Earthquake)
Blizzard ( Fly)
Fire Blast

Zapdos
Thunder
Drill Peck ( Fly)
Thunder Wave
Toxic

Charizard
Blast Burn
Flamethrower
Overheat
Fly

Tauros
Return
Thrash
Earthquake
Hidden Power ( Psychic ) or Ice Beam

Articuno
Fly
Blizzard
Hail
Hyper Beam ( Ice Beam)

or

Mew
Psychic
Calm Mind
Water Pulse ( Waterfall or Surf )
Shadow Ball

I would think this is a fool proof team