Archeops (M) @ Rock Gem
Trait: Defeatist
EVs: 252 Atk / 4 SAtk / 252 Spd
Naughty Nature (+Atk, -SDef)
- Head Smash
- Acrobatics
- Earth Power
- Roost
Ever thought that Aggron was really weak? Me neither, but regardless, this still puts Aggron to shame, as well as everything else really. A Rock Gem Boosted Head Smash may as well be the last thing you see if you don't have a lot of bulk going for you and resist the move, as it truly hurts. It OHKOs Defensive Slowking, Escavalier, and physically defensive Spiritomb, and uninvested Magneton (after a layer of spikes) while still doing an upwards of 50% to everything EXCEPT Steelix, Ferroseed, Aggron, Torterra, Quagsire, Poliwrath, and Rhydon - according to the Honkalculator everything else viable in RU takes more than this from a single move, which is kind of scary, and even then the last four need to be physically defensive as otherwise they still take a ton of damage.
Acrobatics is standard fare on an itemless Archeops, and Earth Power kills Steelix, Aggron, etc. Roost is there because Archeops is probably in defeatist range after it smashes its head in and it would appreciate this not happening. Also, the nature is naughty because the goal is to hit once very hard mainly, and you may as well go all in.
Manly Calcs
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 252 HP/0 Def Eviolite Gurdurr: 43.32% - 51.34% (2-3 hits to KO)
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 252 HP/0 Def Regirock: 63.46% - 75% (2 hits to KO)
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 252 HP/252 Def Alomomola (+Def) : 66.29% - 78.09% (2 hits to KO)
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 156 HP/0 Def Golurk: 71.51% - 84.36% (2 hits to KO)
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 0 HP/0 Def Magneton: 92.12% - 108.3% (50% chance to OHKO)
252 Atk Rock Gem Archeops (+Atk) Head Smash vs 252 HP/144 Def Slowking: 109.9% - 129.44% (Guaranteed OHKO)