You Cannot catch lucario on pokemon black the only Way is to trade him or catch a riolu.
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Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
Lucario learns Aura Sphere at level 51.
There isn't one. But you could try to obtain a ditto. And breed the lucario with the ditto until, you find a female. Pokemon Master & Lucario Biologist ~Bolt the lucario
evolve a riolu from challenge cave your welcome :)the dude
You can fight Cynthia in black or white after you beat the elite four and ask for him/her at GTS.