What is the name of the underwater town in Pokémon Pokopia's first expansion?

Bubbly Basin is the underwater town in Pokémon Pokopia's first expansion.

Bubbly Basin is Part 1 of the Pokémon Pokopia Expansion Pass. It adds a new town to explore, along with additional Pokémon and furniture. The expansion became available on August 5, 2026.

Access to the underwater setting is connected to the free update's new Dive move. Players can use that ability to travel below the waves and explore the town, giving the expansion a distinct aquatic focus compared with the original game's land-based restoration activities.

The Expansion Pass is planned in three parts. Part 2 is scheduled for winter 2026 and adds accessories, Pokémon, and furniture without introducing a new town. Part 3 is scheduled for 2027 and will add another town. Bubbly Basin is therefore the first expansion town, not the name of the entire pass.