A TM, or Technical Machine, teaches a particular move to compatible Pokémon. In some games TMs are reusable, while in others they are single-use or crafted from materials. Compatibility is determined by the species and game, not simply by type; a Water-type Pokémon may not learn every Water move. TMs are useful for giving coverage, replacing weak level-up moves, or preparing a Pokémon for a particular battle. Before using a rare or single-use TM, check whether it can be obtained again and whether another team member needs it more. Modern games often make move changes easier than older titles.
