Go to Canalave City and get on the boat to Iron Island. Then complete that place to get a Riolu Egg and walk about 2500 steps. Level him up with high enough friendship between 4 AM and 7:59 PM.
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Lucario learns Aura Sphere at lvl 42 in Pokémon Platinum
You can't get lucario in heartgold or soulsilver. You have to trade it from Diamond, Pearl or Platinum. Hope it Helped. Pokemon Master & Lucario Biologist. ~Bolt the lucario
you get a riolu which can evolve into lucario
You can't lucario didn't exist until diamond, pearl, platinum came out which came after emerald.
from Riley he gives you a Riolu egg and you can evolve it at high friendship