Part 1 of the Pokémon Pokopia Expansion Pass adds Bubbly Basin.
Bubbly Basin is presented as a new town in the first part of the paid Expansion Pass. The content also includes additional Pokémon, furniture, and related features, extending the rebuilding and decorating systems introduced in the base game.
The Expansion Pass is divided into three parts. Part 2 is planned around accessories, additional Pokémon, and furniture, but it does not add a new town. Part 3 is planned to include another new town and further Pokémon and furniture content.
This structure can cause confusion because the pass was sold as one package while its content was released in stages. Bubbly Basin belongs specifically to Part 1, not to the later accessory-focused Part 2 or the future town planned for Part 3.