When does Lucario learn aura sphere in Pokemon Platinum?

You could look on "when does lucario learn aura sphere?" without the Pokemon Platinum in it, and that might be right. It says LVL. 36 I am so close to getting my Lucario to learn Aura Sphere! Also if you play WizArd101 pleez be my friend I am Gabriel ThunderStrider Initiate Theurgist!