All of the characters in the game can only use a single Pokémon as part of the “Sync Pair” mechanic. The roster of characters currently include the likes of Brock, Misty, the Kanto Elite Four from Pokémon Red & Blue, Clair from Pokémon Gold & Silver, Drake from Pokémon Ruby & Sapphire, Barry and Cynthia from Pokémon Diamond & Pearl, Iris from Pokémon Black & White, and Kahili from Pokémon Sun & Moon. The player must form a team with one of these classic Pokémon trainers in order to take on the Pokémon Masters League, which involves fast-paced real-time battles rather than turn-based ones. Pokémon Masters is a free-to-start game that includes in-app purchases. For example, the ability to unlock new “Sync Pairs” is tied to a random loot box mechanic where the player spends gems in order to acquire new characters, but players can also unlock them faster by spending real money if they so choose.