>>17842291...Do people just not use Physical attackers? Or residual damage? Or Roar/Whirlwind?
I'm assuming that that set only works on scrubs or else after your foe's team has been weakened considerably.
252+ Atk Choice Band Technician Scizor Bullet Punch vs. 252 HP / 0 Def Sylveon: 458-542 (116.2 - 137.5%) -- guaranteed OHKO
252+ Atk Choice Band Technician Scizor Bullet Punch vs. 252 HP / 252 Def Sylveon: 336-396 (85.2 - 100.5%) -- 6.3% chance to OHKO
You need to use Calm Mind twice in order to have a shot at a 2HKO with Shadow Ball on that set.