HM02 - Fly is a powerful HM that allows you to fly to any town or city you've already visited in the game.
Here's what you need to know about HM02:
* Location: You can obtain HM02 from the Pokémon Fan Club in Goldenrod City after obtaining the National Pokédex. This requires completing the Kanto region after defeating the Elite Four in Johto.
* Requirements: You need to have a Pokémon that can learn the Fly move (like Pidgey, Starly, or Swellow).
* Usage: Once you learn Fly, you can use it in any town or city you've previously visited by pressing Start and selecting Fly. You'll then see a map with all the visited locations.
* Benefits: Flying saves a lot of time and effort, especially when traveling between distant locations.
Let me know if you have any other questions about HM02 or other aspects of Pokemon HeartGold!