Question

Since Dive wasn't an HM in FireRed/LeafGreen, can you teach a Pokemon Dive in R/S/E Dive, trade it to FR/LG, and migrate to D/P/PT/HG/SS?

Answer 1

Never mind, I just found out. You can't migrate Pokemon with Dive into Gen IV from FR/LG.

Answer 2

Yes, because Dive is a move in FR/LG.

Comments

but it was introduced in third gen

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FR LG is Gen III

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Your source?

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The fact that FR and LG were released between R/S and Emerald
http://en.wikipedia.org/wiki/List_of_Pok%C3%A9mon_video_games