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Pinsir @ Choice Scarf
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- X-Scissor
- Close Combat
- Stone Edge
- Earthquake
Scarfed Pinsir can OHKO both mons with X-Scissor. It might even go on a killing spree after the Moxie boost. Only problems are faster scarfers like Jynx and Rotom. Pinsir outspeeds both mons with the Choice Scarf but it's up to you if you want to outpeed more stuff like +1 Lilligant and +1 Vivillon (Jolly Nature) or do more damage to mons like Xatu and Steelix (Adamant Nature). Personally i'd choose the latter.
A useful calc:
252+ Atk Life Orb Shiftry Sucker Punch vs. 0 HP / 0 Def Pinsir: 156-185 (57.5 - 68.2%) -- guaranteed 2HKO