Kill him as early as you can, but keep in mind a high-Aura Aura Sphere or b-air.
Lucario is a generally versatile fighter, so make sure you're ready to adapt to his style. Lucario isn't a gimmick anymore.
Lucario has a good combo game at low percent and good kill power when at higher percent.Kill him asap. (Note if you die to a high level aura lucario his combo game is not as good because he does more knockback)
