You can fight Cynthia in black or white after you beat the elite four and ask for him/her at GTS.
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You Cannot catch lucario on pokemon black the only Way is to trade him or catch a riolu.
Lucario learns Aura Sphere at level 51.
evolve a riolu from challenge cave your welcome :)the dude
Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
Lucario is a fighting and steel type Pokemon.