Science Fair Project Encyclopedia
Technical Machine
In the fictional world of the Pokémon video game franchise, a Technical Machine (TM) is a machine used by Pokémon Trainers to teach Pokémon new moves quickly and easily.
There are 50 different TMs per era; each one teaches a different move and is found in a different place. Approximately two-thirds of the TMs available in a game are given to the player by non-player characters, with the other half being purchasable, either from the game's major department store(s) (in Celadon City, Goldenrod City or Lilycove City) or its Game Corner (in Celadon, Goldenrod, or Mauville City).
The TM is only good for one use, after which it becomes useless and disappears from the player's inventory. Pokémon hatched from eggs can inherit TM moves from their fathers.
Hidden Machines
A Hidden Machine (abbreviated HM) is a special type of Technical Machine. Unlike TMs, HMs can be used unlimited times. All moves taught by HMs, unlike most TM-learned moves, can be used outside of battle, and most of these moves are either necessary to pass an obstacle or convenient in aiding transportation. Some or all of the eight badges available from Gym Leaders in each game allow the player to use these moves outside of battle.
- Pokémon Red, Blue, Green, and Yellow have five HMs — in order, they teach the moves Cut, Fly, Surf, Strength, and Flash.
- Gold, Silver, and Pokémon Crystal have seven HMs — the five from Red, Blue, and Yellow plus HMs 6 and 7, which teach Whirlpool and Waterfall, respectively.
- Ruby, Sapphire, and Emerald have 8 HMs — the same as Gold, Silver, and Crystal with a different HM 6 (Rock Smash instead of Whirlpool) plus HM 8, which teaches Dive.
- FireRed and LeafGreen have 7 HMs — the same as in Ruby, Sapphire, and Emerald minus HM 8.
- There are no HMs in Pokémon Colosseum.
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