Question

Can you re-learn moves in Crystal?

Answer 1

No, you cannot have Pokemon re-learn moves in any games before Generation 3.

Source

Comments

I read somewhere that after the Elite Four I can re learn moves

---

According to this, http://www.gamefaqs.com/boards/375087-pokemon-crystal-version/42501937
there is a man that can teach your Pokemon a few different moves after you beat the Elite Four, is that was you're thinking about?

Answer 2

No, you cannot relearn moves in Crystal. The only way in generation 2 to relearn moves was playing Pokemon Stadium 2. If you beat the Elite Four and the Champion in the gym leader castle with a team consisting of only Pokemon youve caught and trained (so no rentals). You are then given the option to teach ONE of your Pokemon a move it used to know. You can repeat this several times.