Doublade as a
hard check
Doublade @ Eviolite
Ability: No Guard
EVs: 252 HP / 160 Atk / 96 SpD
Adamant Nature
- Swords Dance
- Iron Head
- Shadow Claw
- Shadow Sneak
Although Doublade fears the 2HKO from CB Earthquake from Tyrantrum, it can tank Tyrantrum's main attack Head Smash decently well and threaten it with Iron Head, although you need to get a bit of chip damage on Tyrantrum to ensure the KO with Iron Head + Shadow Sneak. Doublade shouldn't be sent on CB Tyrantrum recklessly, because it lacks recovery.
Calcs:
252+ Atk Choice Band Tyrantrum Head Smash vs. 252 HP / 0 Def Eviolite Doublade: 90-106 (27.9 - 32.9%) -- guaranteed 4HKO
252+ Atk Choice Band Tyrantrum Earthquake vs. 252 HP / 0 Def Eviolite Doublade: 160-190 (49.6 - 59%) -- 99.6% chance to 2HKO
160+ Atk Doublade Iron Head vs. 4 HP / 0 Def Tyrantrum: 204-242 (66.6 - 79%) -- guaranteed 2HKO
160+ Atk Doublade Shadow Sneak vs. 4 HP / 0 Def Tyrantrum: 51-61 (16.6 - 19.9%) -- guaranteed 6HKO