Scyther @ Focus Sash / Wide Lens
Nature: Adamant (+Atk -SpAtk)
EVS: 252 HP, 252 Atk, 4 Spd
- Aerial Ace
- Brick Break
- Fury Cutter / X-Scissor
Okay, so this set doesn't have much going for it, I know. But its main purpose is to counter physical sweepers with... what else? Counter. The reason why it has no Def EVs is because it doesn't need them. HP is the only factor in how powerful Counter is, and with its Focus Sash, if an OHKO is negated by it, Counter's power will be as high as it gets. Aerial Ace is for STAB, Technician boost and priority. Brick Break is to break barriers and/or destroy special walls. Fury Cutter has high, however not perfect accuracy, is boosted by Technician, has STAB and gains power every turn if used consecutively. X-Scissor is an alternative if you don't want to switch out the Focus Sash for a Wide Lens or similar item, since it still gains STAB.
Swords Dance is a popular choice for Scyther's movesets, but here, it doesn't really need it.