Tyrantrum @ Choice Band
Adamant Nature
Ability: Rock Head
EVs: 252 Atk / 4 Def / 252 Spe
- Head Smash
- Outrage
- Fire Fang
- Earthquake

Calcs:
252+ Atk Choice Band Tyrantrum Head Smash vs. 252 HP / 252+ Def Corviknight: 267-315 (66.7 - 78.7%) -- guaranteed 2HKO after Leftovers recovery

252+ Atk Choice Band Tyrantrum Head Smash vs. 252 HP / 252+ Def Skarmory: 219-258 (65.5 - 77.2%) -- guaranteed 2HKO

-1 252+ Atk Choice Band Tyrantrum Head Smash vs. 252 HP / 112+ Def Landorus-Therian: 226-267 (59.1 - 69.8%) -- guaranteed 2HKO after Leftovers recovery

252+ Atk Choice Band Tyrantrum Fire Fang vs. 252 HP / 0 Def Ferrothorn: 352-416 (100 - 118.1%) -- guaranteed OHKO