Pokémon Masters is a mobile game in the Pokémon franchise where players team up with famous Trainers from across the series to form sync pairs and battle in 3-on-3 matches on the island of Pasio. It features story-driven events, character interactions, and frequent updates that add new Trainers, costumes, and special events. The game is known for bringing together characters from many different Pokémon generations in one place.