HM07 (or Hidden Machine 07) is able to permanently teach a Pokémon a move for use outside of battles. In the first generation of games there were only five hidden machines and HM07 made its debut in the second generation allowing a Pokémon to learn Waterfall. In the third and fourth generations it allows for a Pokémon to learn Waterfall (as well as in Mystery Dungeon). It is not featured in the fifth generation.
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