Master Trainer

A Master Trainer (Japanese: マスタートレーナー Master Trainer) is a type of Pokémon Trainer in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!. They are 153 Trainers who each specialize in a different species of from Generation I, plus  and. They can be encountered in various locations around Kanto after becoming. Master Trainers wear red clothing and have the icon of their favorite Pokémon in a bubble above their heads. Their Pokémon are high leveled and tend to have a lot of s and maximum s in certain stats.

When the undefined battles a Master Trainer, they can only use one Pokémon of the same species as the Master Trainer's favorite and neither party can use items other than their Key Stone and Mega Stones in battle. Upon defeating one, their title can be used by the player in Link Battles. While the Master Trainers do not use Alolan Pokémon or Mega Evolution, the player is permitted to use them when challenging their respective Master Trainers. The player's party will be fully restored before and after each battle against a Master Trainer. If the player wins, the Master Trainer can be re-battled the following day; if the player loses, they can speak to the Master Trainer for an immediate rematch. Master Trainers do not give out prize money when defeated, nor do players black out and payout money if they lose.

The Master Trainers for Legendary Pokémon, Mythical Pokémon, and do not battle the player. Instead, they grant the player their title upon showing them a Pokémon of their respective specialty with a high enough. These Trainers all have the appearance of a Master Trainer.

Defeating at least six Master Trainers allows the player to battle outside the Pokémon League at Indigo Plateau, who will grant the player the title of Battle Master (Japanese: バトルマスター Battle Master) after being defeated. Earning every Master Trainer title, except for those of Mythical Pokémon, earns the player the title of Grand Master (Japanese: グランドマスター Grand Master).

Trivia

 * The Master,  Marge, takes the place of Pewter City's Pokémon Center Jigglypuff NPC from the previous games. The Jigglypuff has been relocated to the  Pokémon Center.
 * The of the Onix Master,  Jim, knows, which Onix cannot legitimately learn.
 * The English names of the and  Master Trainers, West and Keaton, are based on  and, both of whom have played the role of.