Datamined information from Pokémon: Pokopia points to future additional content, with over 20 Pokémon reportedly set to join the game via future DLC. However, this claim has not been officially confirmed, and the specific list of these Pokémon has not been disclosed.
The available materials do not provide relevant data files, version identifiers, or the identity of the dataminer, so the specific quantity and lineup cannot be verified at this time. These clues should not be considered as DLC content already announced by the developers; whether they will ultimately be implemented remains to be confirmed by official announcements.
Pokémon: Pokopia is now available on Nintendo Switch 2. New content allowing players to dive into the sea was released with the first DLC and officially made available through the 2.0.0 update, as previously introduced in a new trailer.
The second DLC has also showcased more content, while this datamining pertains to further future additions. At this stage, it is important to distinguish between the live 2.0.0 update, the showcased second DLC, and the unconfirmed clues regarding future DLC.