Pokémon Pokopia supports up to four players in its multiplayer modes.
Nintendo lists the game as supporting one to four players on a single system, two to four players through local wireless, and one to four players online. This makes four the maximum party size regardless of whether players gather locally or connect online.
Multiplayer lets visitors spend time in a player’s created home and restored world. The game also supports GameShare, allowing someone who does not own the game to visit under the feature’s session requirements. GameShare does not increase the normal four-player limit.
The figures can be confused because the modes have different minimums. Single-system play can begin with one player, while local wireless requires at least two systems or participants. Online play can also involve one player. The shared maximum, and therefore the answer to the question, is four players.