Fast TM

A Fast TM is a Technical Machine that can be used to teach a Pokémon a new Fast Attack.

In-game description
''This Technical Machine item is used to teach your Pokémon a new Fast Attack. Your Pokémon will acquire a new Fast Attack and forget their old Fast Attack.''

Trivia

 * Using a Fast TM will teach a Pokémon a new random Fast Attack, which is available for the Pokémon to learn and is not same as the attack that is being forgotten.
 * Most Pokémon have two possible Fast Attacks, therefore it is almost guaranteed that the Pokémon will learn the desired Fast Attack.
 * Rarely a Pokémon can have only one possible Fast Attack e.g. Moltres, Zapdos, etc., therefore it's not possible to use Fast TM on these and they will not show on the list while using Fast TM.
 * A Legacy Fast Attack cannot be learnt by using a Fast TM, however a Legacy Fast Attack can be replaced by an available attack in the Pokémon's learnset.