Where can I relearn a move in Pokemon Platinum?

Question

I want to know because I want a Gengar who has hypnosis.

Answer 1

Pastoria City.

Explore around the houses to find the right one, the guy wants heart scales, which you find under ground by digging in walls using your explorer's kit.

Comments

Okay so I basically just have to keep digging for a ton of heart scales if I want to relearn a move?

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yeah, pretty much lol

Answer 2

In sunnyshore city there will be a man who wants shards and will trade tms for them
he aspecilly wants red shards