Special set of "Pocket Monster Let's Go!" and Monster Ball-shaped game controller "Monster Ball Plus" which can be used as a replacement for "Joy-Con". "Monster Ball Plus" features motion controll, lighting, vibration, and sound functions. Once you catch a Pokemon, the "Monster Ball Plus" recreates the feeling of the captured Pokemon with vibration, lights, and sound adding more realness to the game. Besides its functions as a game controller, players can choose a favorite Pokemon character from "Pocket Monster Let's Go!" to place inside "Monster Ball Plus" to take it out to the real world to spend time together even outside of the game. Players will find pleasant surprises when they come back to play the game. Moreover, "Monster Ball Plus" holds the mythical Pokemon, Mew inside which can be taken out to "Pocket Monster Let's Go!". "Monster Ball Plus" can be used as "Pokemon GO Plus".

Note that Mew captured in smartphone app "Pokemon GO" can not be taken to "Pocket Monster Let's Go!" and likewise, Mew from "Monster Ball Plus" can not be taken to "Pokemon GO". Although players do not have to be a member of "Nintendo Switch Online" to take Mew out, players will need to connect their Nintendo Switch to the internet to take Mew to "Pocket Monster Let's Go!" for the first time. Following a limited period from the release of "Monster Ball Plus", Mew will no longer be provided with "Monster Ball Plus".

This game can be played with 1-2 players.