Pokémon Pokopia will release its underwater DLC, Bubbly Basin, on August 5, 2026, according to a leaked trailer. The expansion adds underwater exploration, aquatic-themed furniture and outfits, and several new water-type Pokémon. A separate leak earlier in 2026 mentioned cosmetic items such as ties, wings and hats, and fans have speculated about possible shiny variants, though this has not been confirmed. Bubbly Basin is offered as part of a $34.99 expansion pass, which also includes two additional DLC updates. Part 2 of the pass is scheduled for release in late 2026, and the final update is expected in 2027, featuring a new town and additional characters. As of March 2026, Pokopia had sold more than four million copies, placing it among the top five best-selling Nintendo Switch 2 titles. Fans of Pokémon Winds and Waves may view the DLC as an early preview of the upcoming mainline title, which also focuses on underwater gameplay. The timeline suggests the mainline game may not launch until after 2027.