The Pokemon Company and Nintendo have shared a new video, details, and screenshots for Pokemon: Let’s Go, Pikachu! and Pokemon: Let’s Go, Eevee!. The trailer and detail highlights Master Trainers, people whom you can meet and battle Pokemon with.
Here’s more detail about the master trainers, taken from nichegamer:
Once you become the Pokemon League Champion, your journey is far from over! After earning that coveted title, you will find new special Trainers scattered throughout the Kanto region. These are the Master Trainers, and each of them is considered the strongest Trainer for a specific Pokemon. That’s right—there’s a Master Trainer for every Pokemon in the Kanto region!
Master Trainers are always thinking about their favorite Pokemon, so you can spot them at a glance. The icon of the Pokémon they favor is displayed above their heads, and the color of their attire is different than other Trainers, too.
Some Master Trainers will have a simple request for you, but most of them will want to battle! The only catch is that they will only battle against the species of Pokemon they love. You’ll need to train up each of your Pokemon to take on these tough challengers. Because these Master Trainer battles are true tests of you and your Pokemon’s strength, neither you nor the Master Trainer will be able to use items during the match.
Best the Master Trainers in battle to earn their title, proving that you’re also a master of their favorite species. The titles you’ve earned can even be displayed in-game during Link Battles so that your friends can admire your skills. Show what a devoted Trainer you are by challenging all the Master Trainers!