Pokémon Pokopia's Pokédex contains 300 Pokémon species from Generations I through IX.
This roster supports the game's habitat system. Instead of simply catching creatures, players create environments that encourage particular Pokémon to visit and become friends. The selection therefore spans many regions and generations while fitting the settlement-building premise.
The total is a Pokopia-specific roster, not the number of species in the entire Pokémon franchise. National Pokédex totals have continued to grow beyond 1,000, so 300 refers only to creatures included in this game at launch and through its documented content.
Another source of confusion is counting special forms or story characters separately. Named variants such as Peakychu and Mosslax are presented as distinctive Pokopia characters, but the Pokédex figure refers to the game's listed Pokémon entries rather than every visual variation as a separate species.