Well, since it's been a while, here's a core that I'm honestly surprised nobody else uses.
M-PINSIR + SCARF EXCADRILL + ROTOM WASH (Offense)
Mega Pinsir hits ridiculously hard with a +2 Aerilate boosted STAB Return, has a great priority move in Quick Attack, which is also boosted, and is actually pretty damn good in this meta. However, things like Thundurus, Rotom Wash, Talonflame, Rotom Wash, Zapdos, Skarmory, and others can give him trouble. That's where Scarfcadrill and Rotom Wash come in. Scarf Drill can handle Thundurus, Talonflame, Zapdos, and Rotom Wash all after SRs damage, and it can also get rid of Stealth Rocks that Mega Pinsir loathes. Rotom Wash can handle Skarmory, which is very nice, provides a more reliable answer to Talonflame, and Keldeo, who gives this core trouble if MPinsir isn't set up. It also handles fire types bar Zard Y, who already gets revenge killed by Scarf Excadrill. This core is pretty simple to use on the surface, and greatly appreciates Stealth Rocks of it's own to pressure the opposing team, so both Klefki and Clefable are welcome here as well, as they can both spread paralysis and be a general thorn in your opponent's side. Beware though, that Klefki stacks another Fire weakness, so be sure to pack another fire resist or two.



M-PINSIR + SCARF EXCADRILL + ROTOM WASH (Offense)
Mega Pinsir hits ridiculously hard with a +2 Aerilate boosted STAB Return, has a great priority move in Quick Attack, which is also boosted, and is actually pretty damn good in this meta. However, things like Thundurus, Rotom Wash, Talonflame, Rotom Wash, Zapdos, Skarmory, and others can give him trouble. That's where Scarfcadrill and Rotom Wash come in. Scarf Drill can handle Thundurus, Talonflame, Zapdos, and Rotom Wash all after SRs damage, and it can also get rid of Stealth Rocks that Mega Pinsir loathes. Rotom Wash can handle Skarmory, which is very nice, provides a more reliable answer to Talonflame, and Keldeo, who gives this core trouble if MPinsir isn't set up. It also handles fire types bar Zard Y, who already gets revenge killed by Scarf Excadrill. This core is pretty simple to use on the surface, and greatly appreciates Stealth Rocks of it's own to pressure the opposing team, so both Klefki and Clefable are welcome here as well, as they can both spread paralysis and be a general thorn in your opponent's side. Beware though, that Klefki stacks another Fire weakness, so be sure to pack another fire resist or two.
Pinsir @ Pinsirite
Ability: Hyper Cutter
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Return
- Close Combat
- Quick Attack
Excadrill @ Choice Scarf
Ability: Mold Breaker
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
[/hide=Importable]
Ability: Hyper Cutter
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Return
- Close Combat
- Quick Attack
Excadrill @ Choice Scarf
Ability: Mold Breaker
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Iron Head
- Rock Slide
- Rapid Spin
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split
[/hide=Importable]