Pokopia's first DLC as part of the Expansion Pass is the Bubbly Basin, an underwater world with new Pokemon, building materials, habitats, plants, and more. While there was also a free update that added the Dive ability on the same day, to access Bubbly Basin, you will need to have purchased the pass. Related What to Complete in Pokopia Ahead of Bubbly Basin DLC The Underwater expansion to Pokopia comes out August 5th — here's what you need to have ready in-game so you can play Bubbly Basin on day one. How to Get to Bubbly Basin in PokopiaStep #1: Find Professor TangrowthWhen you first open the game with the Pokopia Expansion Pass installed, you will get a notification that Professor Tangrowth wants to talk with you about something in Bleak Beach. Popplio asks you about Bleak Beach and, after learning that you restored it, asks for help restoring Bubbly Basin.