first go through the cave with Riley on iron island and once you beat the team galatic grunts then Riley gives you a egg. The egg contains Rioulu.....the pre-evolution of Lucario. From there just evolve it......a am positive it will be a great edition to your team
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You can't lucario didn't exist until diamond, pearl, platinum came out which came after emerald.
You Cannot catch lucario on pokemon black the only Way is to trade him or catch a riolu.
You can't catch Lucario in any game before Diamond/Pearl.
how do you catch a mewtwo on Pokemon platinum
Lucario learns Aura Sphere at lvl 42 in Pokémon Platinum