Is there a particular reason Deoxys is unable to relearn forgotten moves in Gen 4 mystery dungeon?

Question

I can't find any information on the internet tied to a rhyme or reason, but I suspect there may have been programming difficulties after seeing this. Thankfully it's still early and I just freshly recruited it, and I didn't miss anything substantial. My curiosity is just piqued, and I'm disappointed they couldn't find a workaround if that's the case.

Comments

Does this count as a Game Freak logic question?
(yes I know Game Freak didn't make the MD games)

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I don’t think it does @sumwun

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Why not? The asker already knows exactly how a mechanic works and is asking why the designers designed the mechanic that way.

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I don't think they know how the mechanic works, they are questioning if their idea of how the mechanic works is correct

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I think this is answerable, but it's on the edge.

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I don't know if there are any MD experts on this site :p

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Can you use Doom Seeds?

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Does this also happen to Shaymin (another mon that can change forms inside a dungeon and has different learnsets based on form)?

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Picked a good time to come back and be alive. Unfortunately, I have no idea. I've never recruited Shaymin.