No, it cannot.
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yes. If your riolu evolves after level 37 it will not learn aura sphere. lucario learns aura sphere at lv 37
27 my lucario learnt aura sphere lv37
aura sphere
yes Arceus can learn aura sphere because it is the god of pokemon. Also Arceus can learn 529 moves out of 559 moves
Lucario learns Aura Sphere at level 51.