HM06 (or Hidden Machine 06) 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 HM06 made its debut in the second generation allowing a Pokémon to learn Whirlpool. In the third and fourth generations it allows for a Pokémon to learn Rock Smash (as well as in Mystery Dungeon). In the fifth generation it allows for a Pokémon to learn Dive.
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