Is it possible to level down Pokemon?

Question

I am not sure if there is a way to without hacking, so I would like to know.

Example: If I turned down Lugia learning Ancient Power, and I changed my mind, and I was too lazy to find a Heart Scale, would I just have to go find one anyway?

Comments

I believe in PMD there was a seed that levelled you down. I think it was called the doom seed.
Irrelevant, yes, but in PMD you could level someone down. You could eat it yourself, but you're meant to throw it at an enemy.

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Whenever I tried that they'd catch it and throw it at me :\

Answer 1

Yes, unfortunately you have to bust your butt finding Heart Scales because there is absolutely no way to take your Pokémon down a level. The only way to do this is, as you said, by modifying them via hacking or genning.

Source: Knowledge