Stakataka @ Weakness Policy
Sassy (+SpD - Spe)
252 HP / 252 Atk / 4 SpD
IVs: 0 Spe

Gyro Ball
Stone Edge
Earthquake / Superpower
Trick Room

>Turn 1: get hit SE and set up Trick Room

252+ Atk Life Orb Mew Earthquake vs. 252 HP / 4 Def Stakataka: 270-322 (82.8 - 98.7%) -- guaranteed 2HKO
>Always survives EQ from maximum-investment non-STAB LO base 100s

0 SpA Rotom-Wash Hydro Pump vs. 252 HP / 0+ SpD Stakataka: 224-266 (68.7 - 81.5%) -- guaranteed 2HKO after Leftovers recovery
>Can tank some STAB SE special hits even without SpD investment


>Turn 2: Hit stuff hard
+2 252 Atk Stakataka Gyro Ball (150 BP) vs. 240 HP / 156 Def Mew: 423-498 (105.4 - 124.1%) -- guaranteed OHKO
>Guaranteed OHKO on neutral 100/100 bulk

Stakataka has the best Gyro Ball in the game and underspeeds everything for Trick Room. It has just enough coverage to take on the bulk of the meta with 3 moves and only the Water and Fighting priority moves hit it SE.

This thing will see some use. It might not be the strongest mon, but it has just enough of a movepool to be functional.

Its Beast Boost will unfortunately be in Def with this setup, but it's still okay. The EVs/nature also still need some tuning as well.

It's also the bulkiest mon to get Block and Recycle, for ragequit gimmick sets.