Pokemon Brilliant Diamond and Pokemon Shining Pearl's Technical Machines, otherwise known as HMs, have been around in the Pokemon universe for a very long time, allowing trainers the opportunity to teach a specific move to one of their Pokemon, as long as it fits within that Pokemon's typing, however. For example, players will not be able to teach Sludge Bomb to a Pokemon like Pikachu.
In Pokemon Brilliant Diamond and Pokemon Shining Pearl for the Switch, Sludge Bomb is not only back as an
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