Team I believe would be the best in Pokemon Statium 2:

[invinible]

In Little Cup:

I don't know

In Poke Cup:

L51 Gengar with maximum stats.
Item holding: Focus Band
Moves: Shadow Ball, Toxic, Sleep Talk, Rest

L51 Girafarig with maximum stats.
Item holding: Leftovers
Moves: Strength, Psychic, Sleep Talk, Rest

L51 Scizor with maximum stats.
Item holding: King's Rock
Moves: Metal Claw, Fury Cutter, Sleep Talk, Rest

L51 Houndoom with maximum stats.
Item holding: Bright Powder
Moves: Crunch, Flamethrower, Sleep Talk, Rest

L52 Quassire with maximum stats.
Item holding: Scope Lens
Moves: Earthquake, Surf, Sleep Talk, Rest

L52 Zapdos wth maximum stats.
Item holding: Miracleberry
Moves: Drill Peck, Thunderbolt, Sleep Talk, Rest

In Prime Cup, Gym Tower, and Rival Battle:

L100 Gengar with maximum stats.
Item holding: Focus Band
Moves: Shadow Ball, Toxic, Sleep Talk, Rest

L100 Girafarig with maximum stats.
Item holding: Leftovers
Moves: Strength, Psychic, Sleep Talk, Rest

L100 Scizor with maximum stats.
Item holding: King's Rock
Moves: Metal Claw, Fury Cutter, Sleep Talk, Rest

L100 Houndoom with maximum stats.
Item holding: Bright Powder
Moves: Crunch, Flamethrower, Sleep Talk, Rest

L100 Quassire with maximum stats.
Item holding: Scope Lens
Moves: Earthquake, Surf, Sleep Talk, Rest

L100 Zapdos wth maximum stats.
Item holding: Miracleberry
Moves: Drill Peck, Thunderbolt, Sleep Talk, Rest

[Mana Lugia]

Poke Cup:
Gengar, Giraf, Scizor are far from having decent movesets.

Prime Cup: Same as above.