For Metagross, Go for Adamant. Max EV in Atk and maybe Spd if you want to keep Agility.
Metagross @ Life Orb (or something else)
Adamant. EVs: 6 HP, 252 Atk, 252 Spd
For Scizor, if you give it Choice Band, then you can't use Swords Dance or Roost because you'll be stuck with it. Instead of Choice Band, give it... Iron Plate or something.
Scizor @ Iron Plate
Adamant. EVs: 252 HP, 252 Atk, 6 Sp. Def
Gengar @ Focus Sash
Modest. EVs: 6 HP, 252 Sp. Atk, 252 Spd
Starmie @ Choice Specs
Timid. EVs: 6 HP, 252 Sp. Atk, 252 Spd
These 4 should be plenty.
I am a glitcher, not a cheater. I do not alter game codes, but use what's given to get what I want.
Glitches: the solution to the AI's infinite hax. The Battle Frontier AIs may cheat with statistically improbable events happening at every opportunity, but I laugh at their Pokemon team with No Guard Sheer Cold. They may never miss Sing and Grasswhistle, but they can't pull out a Ninjask with Spore. They may never miss Thunder and Hurricane, but they can't pull out a Jolteon with Water Spout and Hurricane in the middle of a Drizzle set. In short, the AI can kiss my a-
As I believe in fairness in battle, I will not abuse the power. In any and all player battles, only RNG is used. No glitches without prior consent.