Instructions
Catch a wild Pokemon that can learn Aura Sphere. Mienfoo and its evolved form Mienshao can both unlock Aura Sphere. Mienfoo is found in Route 14, Dragonspiral Tower and Victory Road. Mienshao is found only in Route 14 or it can be evolved from a Mienfoo.
Catch a wild Pokemon that can evolve to a Pokemon that can use Aura Sphere. Catch a Riolu in Challenger's Cave and evolve it to Lucario. Catch a Togepi in White Forest and evolve it to a Togetic and then finally a Togekiss.
Train your Pokemon by battling other Pokemon until they are a high enough level to use Aura Sphere. Some Pokemon will learn the move immediately, such as Togekiss, while some Pokemon will learn the move at higher levels, such as Mienshao, which learns the move at level 70.
Open your Pokemon menu and set Aura Sphere as one of your Pokemon's attacks after it has learned the move.
Select "Aura Sphere" from your Pokemon's attack menu the next time you enter a Pokemon battle to perform the special move.