HM01 (Japanese: ひでんマシン０１Secret Machine 01) is an HM introduced in Generation I. It teaches a compatible Pokémon a move that can also be used in the field; but using an HM in the field requires that the player have a certain Badge (except in Generation V). HM01 has always been Cut. For compatibility, refer to the move's page. HMs can used to teach moves without limit.
HMs in the Mystery Dungeon series are named only by the move they teach. For example, Cut is the item that teaches the move Cut. Most HMs, however, correspond to an HM in the core series' contemporaneous games.
HMs in Pokémon Mystery Dungeon games prior to Pokémon Super Mystery Dungeon can be used any number of times. In Pokémon Super Mystery Dungeon, "HMs" are treated like TMs and only usable once. However, if an "HM" is dropped on the ground, it has a different color than a TM.
Cut is the item that teaches the move Cut. Most HMs, however, correspond to an HM in the core series' contemporaneous games.
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