* Move Tutors: Certain moves can be re-learned by visiting Move Tutors scattered around the game. They offer a variety of moves for different Pokemon. You can find them in places like the Goldenrod City Department Store, the Battle Frontier, or the Pokemon Mansion.
* TMs and HMs: Some moves can be re-learned using TMs and HMs. You can find these items in various locations throughout the game, or sometimes they can be bought in shops.
* Breeding: If a Pokemon learns a move through breeding, its offspring will inherit that move. However, not all moves can be learned through breeding.
Limitations:
* Evolution: If a Pokemon evolves, it might lose some of its old moves.
* Move Pool: Each Pokemon has a limited "move pool" of moves it can learn. If a Pokemon has already learned its maximum number of moves, it can't learn any new ones unless it forgets one first.
* Level: Some moves may have a specific level requirement.
Finding Out What Moves Your Pokemon Can Learn:
* Talk to Move Tutors: Move Tutors will usually tell you what moves they can teach your Pokemon.
* Consult the Pokedex: The Pokedex will list all the moves a particular Pokemon can learn.
* Check the Internet: There are many websites and resources that list move pools for all Pokemon in HeartGold and SoulSilver.
Important Note: Certain events in HeartGold and SoulSilver, like the Battle Frontier, may make it possible to re-learn moves that would normally not be available.
Let me know if you have any other questions about HeartGold and SoulSilver!