Celesteela @ Leftovers
Ability: Beast Boost
EVs: 252 Atk / 4 HP / 252 Spe
Adamant Nature
- Earthquake
- Heavy Slam
- Stone Edge
- Autotomize
This set works really well for me and I really think it should be on the first page somewhere. Stone Edge is my preferred option for hitting water/bugs and flying guys that resist Heavy Slam (Gyarados, Mantine, etc...). People really underestimate this guy. I prefer Leftovers over Life Orb since Celesteela has such great typing and bulk. Adamant lets you outspeed everything un-boosted so you only lose to Choice Scarf but unless its super effective you'll likely KO back. Heavy Slam is ridiculously good with Fairies everywhere.
This relies on you getting a Beast Boost for actual damage, because I'm pretty sure you don't OHKO anything of note unboosted- you're also hard walled by Ferrothorn, opposing stall Celesteelas running Leech Seed, and Skarmory in general, not to mention Gliscor. The rare Balloontran also will probably OHKO you as well (Pretty sure even with a crit Stone Edge won't kill it outright even after Stealth Rock)