You'd have to take it to the Move family house in Mystaltron, and pay with a Heart Scale to allow it to relearn old moves.
(It can relearn a move it never actually knew, all the relearner does is let it access all level-based moves of a lower level than it is now).
Lucario learns Aura Sphere at level 51.
IN POKEMON PLATINUM, MY LUCARIO HAD TO WAIT UNTIL LEVEL 37 TO LEARN AURA SPHERE. YOU MAY BE ABLE TO LEARN IT EARLIER IF YOU WAIT TO EVOLVE YOUR RIOLU =)
Lucario learns Aura Sphere at lvl 42 in Pokémon Platinum
Lucario learns Aura Sphere at level 37.
27 my lucario learnt aura sphere lv37
yes
Lucario cannot learn Aura Sphere until it reaches level 51. If you obtained a Lucario without Aura Sphere and over level 51, then you may need to have a move reminder teach Lucario Aura Sphere again.
no it is not a high level lucario is a good Pokemon to have and his attack aura sphere is one of the best on the game
37 in diamond if it doesn't learn it use move remember
yes. If your riolu evolves after level 37 it will not learn aura sphere. lucario learns aura sphere at lv 37
Riolu does not learn "Aura Sphere", as it is not in its learnset. To get Riolu to learn "Aura Sphere", you must evolve it into Lucario. Lucario learns Aura Sphere sometime in level 30-40. If you are higher than that, simply go to Electivire Link Shop
You must first evolve it to Lucario, then level it up.