This is scary: Choice-Banded Scizor does 81.87% to the standard metagame, with a moveset of
Bullet Punch
Superpower
U-Turn
Night Slash
Inside the thingy, I actually put the following:
Magnet Bomb
Superpower
U-Turn
Night Slash
to account for technician.
Next, i looked at SD scizor with life orb (Attack stat of 1024)
Bullet Punch
Brick Break
X-Scissor (NOT BUG BITE)
and it gave me 93.36%!!!!
Now, we look at a guy who got banned from OU, and you see why he got banned. SD Chomp, with the same stat of SD scizor, with the moveset Outrage, Earthquake, Fire Fang, gives 99.82%. Even if you lower Outrage to Dragon Claw, you still get 99.18%, with the best defender being Cresselia, taking a giant 75.37%.
If you lower the attack to 788, for yache berry, the average damage is 96.15%, but you still get a 2HKO on Cress, for 58%, or if you opt for Outrage still, you get 98.84%, with skarmory taking 65.85% from fire fang.