Nominating Banded Crobat as
Counter
Crobat @ Choice Band
Ability: Infiltrator
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Brave Bird
- Cross Poison
- U-turn
- Pursuit
To kill Lucario you just need to hit Brave Bird. If switching in, Crobat only fails to kill if it comes into SR and a high roll Flash Cannon as Lucario can finish with Vacuum Wave.
252 SpA Life Orb Lucario Flash Cannon vs. 4 HP / 0 SpD Crobat: 99-117 (61.4 - 72.6%) -- guaranteed 2HKO
252 SpA Life Orb Lucario Aura Sphere vs. 4 HP / 0 SpD Crobat: 25-29 (15.5 - 18%) -- possible 6HKO
252 SpA Life Orb Lucario Vacuum Wave vs. 4 HP / 0 SpD Crobat: 12-14 (7.4 - 8.6%) -- possibly the worst move ever
252 Atk Choice Band Crobat Brave Bird vs. 0 HP / 0 Def Lucario: 160-189 (110.3 - 130.3%) -- guaranteed OHKO
Edit: Nom'ed as Counter instead of SoftC/HardC