Marshadow @ Life Orb
Ability: Technician
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Close Combat
- Spectral Thief
- Shadow Sneak
- Pursuit
252 Atk Life Orb Marshadow Close Combat vs. 36 HP / 0 Def Arceus: 424-502 (108.7 - 128.7%) -- guaranteed OHKO
Enough said right there. This thing switches into sd, espeed, or the z move then ohkoes back. Marsh also can come in safely on a sack, and since it outspeeds ekiller, there’s little to no risk to marsh. A very straightforward check. The only risk is if you mispredict and switch marsh into a shadow claw, but that should be easy enough to avoid. So yeah, marshadow just flat out obliterates any ekiller that isn’t chople or sub, and this one’s neither.
Edit: added comma for readability