Hidden Machines, or HMs for short, have been a staple of the Pokemon series since it first made its way to western shores more than a quarter of a century ago. These special tools can be used to teach Pokemon moves that can help to open up new areas of the games' worlds. This typically works either by helping players to swim or climb over certain barriers or, in the case of Strength, move them out of the way entirely to open up the path ahead.
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