Pokémon Pokopia features 300 Pokémon.
The game’s roster is drawn from Pokémon Generations I through IX. That gives Pokopia a broad selection spanning the franchise’s original Kanto creatures through species introduced in later generations, while still keeping the game focused on habitat-building rather than conventional team battles.
Pokémon appear in different habitats, and players must shape the environment to encourage particular species to arrive. For example, some Pokémon prefer specific surroundings or objects, so creating the right combination of terrain, plants, furniture, and structures is part of the collection experience.
The number 300 refers to the Pokémon included in Pokopia, not the total number of Pokémon species in the wider franchise. It is therefore different from figures such as the original 151 Kanto Pokémon or the complete National Pokédex, which changes as new games and species are released.