You could try and giving it this-
252 Atk/Spe, Leftovers, Technician
Bug Bite (If it doesn't have technician, give it X-Scissor, but Technician is so much better than Swarm that I would also suggest getting another Scizor)
This is a hard set to pull off, but get one Agility and one Swords Dance in and you're set to destroy your opponent. Bug Bite is quite powerful with Technician and Technician Bullet Punch is definitely Scizor's best move since it has priority and technician and STAB make it quite strong for what it is.