How did Riolu know Aura Sphere?

Question

In that 2 part episode of that riolu that they were trying to steal because it knew Aura Sphere.
I want to know how it knew Aura Sphere.

Answer 1

Sometimes in the Anime Pokemon know moves it cant normally learn, for example, Heatran could use Eruption though it cant learn it in the games.

Comments

If heatran was fast enough and COULD learn eruption...that would be baws

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What the hell? Heatran can't learn Eruption? WTH was Nintendo thinking? SMH!

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Besides, can't you breed Aura Sphere onto Riolu?

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No, you can't. I know cuz I've had several Lucarios, and none of them can learn it as a hatchling. Only when it's a Lucario.

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You've tried? Good to see someone did. :)