Pokémon Masters takes place on the artificial island of Pasio. On Pasio, Pokémon and their Trainers—called sync pairs—share a special bond. Many famous Trainers from every region featured so far in the Pokémon video games have gathered on Pasio along with their partner Pokémon and formed their own sync pairs.

Your Adventure on the Island of Pasio

Pasio is an artificial island where each Trainer has one trusted Pokémon partner. Together, the Trainer and their Pokémon are known as a sync pair, and they participate in 3-on-3 team battles.

3-on-3 Team Battles

The Pokémon Masters League (PML) is a tournament held on Pasio. It features Gym Leaders, Elite Four members, Champions, and other all-stars from every region, who come together to form teams and participate in intense, 3-on-3 team battles. To participate in the PML, players must battle PML Leaders all over Pasio to obtain five badges. You, as the main character, will team up with Pikachu to form a sync pair, sharing in many adventures as you strive to qualify for the PML.

Poryphone

Trainers in Pasio use a device called a Poryphone to access information. It’s a necessary tool containing a wide range of useful features!

Trainers in Pasio use a device called a Poryphone to access information. It’s a necessary tool containing a wide range of useful features!#PokemonMasters pic.twitter.com/CZXW6FEl2a — Pokémon Masters (@PokemonMasters) July 19, 2019

Source: Official Pokémon Masters website