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Expansion Pass

Bubbly Basin

Sunken Cerulean City — Expansion Pass Part 1

The first paid Expansion Pass area, released 5 August 2026 with v2.0.0. Cerulean City now sits on the seabed, and almost all of it is played underwater with the Dive move. Go deep enough and it goes pitch black, so you need light. Crops only grow down here inside bubbles, and buoyant blocks let you build in open water. Six Treasure Maps lead to the six decorative Poké Balls needed for the final habitat, Mermaid's Gym. Manaphy lives here.

Story events here

1
Build the Beautiful Building
In Bubbly Basin, after you have made the area reach Environment Level 3, Popplio will come to you and say it has an idea for something for the area. It will take you to a large area and start building the Ocean Temple
In addition to clearing out the large area Popplio asks for it to go, this build requires 50 Star-spotted rock, 30 Stone, 25 Seashell, 10 Shiny Pearl, 10 Seashell Fencing and 2 Ocean Doors to build. However, there are further tasks required as Popplio wants specific Pokémon to help out: The one with coral horns, the one who is good with their claws, the shy spiky one, the one with the big huge mouth, the one with the charming whiskers and the floaty pink one
Some may have already been found at this point. Coral horns is Corsola, the shy spiky one is Mareanie, the one good with their claws is Corphish, the one with the big huge mouth is Totodile, the one with the charming whiskers is Barboach and the floaty pink one is Frillish.
Totodile can be found near the play area after this. It will ask for you to play with it. You start with which way, play hide and seek and then go to a bathroom where it wants to play with a Bubble Machine. Power it up and it will thank you and then come with you to Popplio's build.
Barboach can be found near the Imperial houses by the planned temple area. It will mention that its Seashell Seat is in the dark valley and that it's too scared to go get it. Go further underwater and retrieve it and Barboach will join you.
Frillish can be found near a cave entrance towards the north of the area and will ask for help finding a Starmie Doll. Go through the Cerulean Cave with it and a Dowsing Machine to find the Starmie Doll in some rocks near a Crystal Cluster. It will then join you to the build.
Once the temple is built, you can enter it where you will find that Manaphy has appeared inside and will stay in the area after thanking for the prior help in Bleak Beach.

Important Requests are the story quests you work through with Professor Tangrowth and the area’s Pokémon. Finishing one raises the area’s Environment Level and your Trainer Rank.

Pokémon you only find here

1
Floatzel

Most Pokémon will move into any area once you build the habitat they like. These are the few genuinely tied to this one, worked out from the areas each Pokémon lives in on Serebii’s habitat pages.

What you can find here

363
Naturally occurring materials 16

these respawn, so they never run out

Sturdy stickStoneVine ropeLeppa berryWatermelonGrubby pearlTwineLumberSea grapesSeashellSea glass fragmentsSeaweedNon burnable garbageGlowing mushroomsLeafFresh carrot
Terrain, plants and blocks 111

the ground, rock, grass and trees the area is built from — dig or cut them up and take them

Seabed tall grassYellow tall grassSeabed flowersSeabed flowers (Purple)Lush SeaweedSeagrape StalkBlooming watermelon plantDriftwoodWhite driftwoodSea mossMossy ocean boulderChimney rocksSmall coralSmall coral (Red)Small coral (Green)Tall coralTall coral (Purple)Colorful coralsLeppa treeTwisty waterweedSeafloor algaeBlue rockBlue cave rockCarved blue rockOcean rockMossy ocean soilStar-spotted rockSeashore grassGlossy tilingVibrant glossy tilingMuddy sandMudBeach sandBumpy Beach sandSeashell soilIron tilingDamaged glossy tilingStone brick wallFarm soilRough wallStone pillar (middle)Cave rockCracked sandstoneStylish brick wall (middle)Stylish brick wall (upper)Crisscross wooden flooringIron-plate flooringRusted iron-plate flooringGrubby ragsSandpileWater pillar quarterPokémon Center wall (trim)Dry leppa treeDry yellow tall grassCobblestone wallLight wooden wallMolten rockDiagonal wooden flooringFoundationDry yellow-green shootsYellow-green shootsTatami matRectangle tilingMossy boulderBrick wallDark marble flooringGray circle flooringMarbleIron columnWorn lumberCube lightOrnate wallLacquered wallExtravagant carpetingStately flooringDamaged stone tilingPlaster wallPop art wall (upper)Pop art wall (middle)Pop art wall (lower)Simple square tilingConfectionery wall (lower)Gradient wall (lower)Gradient wall (upper)Gold wallColorful fish-scale tilingStylish wall (upper)Stylish wall (middle)Concrete wallHardwood flooringSimple flooringHexagonal flooringLight antique wall (lower)Light antique wall (middle)Light antique wall (upper)Dynamic Ditto printFanned-out Ditto printWooden pillar (lower)VineMossMossy stoneCrystal wallChic anchor printColorful anchor printCloth wallSquiggly printConfectionery wall (upper)Confectionery wall (middle)Colorful corals printClustered corals printDamaged stone flooring
Items lying around the area 196

placed objects, picked up once

WorkbenchStorage boxConcrete stepsPointed wooden fencingWorn wooden crateWheelbarrowTraffic coneNettingWorn treasure chestConstruction suppliesStone fragmentsSloped scale roofBroken window paneWindow paneSash windowCash registerLarge mirrorCounterGrubby newspaperHarbor poleMetal fragmentsExcavation toolsMetal debrisDangling streetlightSlim information boardWavy-pattern planterScale roof valleyScale awningWireless power-transmitter postBridge planksGarden lightSimple doorWall lightWooden postsWalkwayDeck chairFlat scale roofIndustrial chairIron tableGrubby tabletPoké Ball bedWall monitorDecorative bookshelfDecorative storage shelfModern sinkCooking stoveFloating logsMenu boardString lightsPop art lampSpotlightStanding micIron stepsBroken iron stepsLampionIron ladderIron enclosureBuried pearlOrnate chairOrnate doorOrnate windowSloped wavy roofFancy wavy roof decorationWood fragmentsSleek stepsBroken bookcaseWavy hipped roofSeashell seatGrubby bookGarbage binSewer-hole coverMysterious pedestalDecorative Great BallDecorative Heal BallDecorative Dive BallDecorative Net BallDecorative Lure BallDecorative Quick ballMysterious statueSpectator chairIron scaffoldMetal drumSandbagsBerry tableBerry chairArrow signArched fencingGrubby letterIron frameTire toySlideTiresConcrete border (line)Concrete border (corner)Industrial benchCushion bedDitto dollToy blocksMini bookcaseWreathPhoto framePlain chestTowel rackWall mirrorBubble machineBathtubGrate flooringBathtime setShell lampVending machineCanoeWooden siding (panel)Wooden siding (corner)Stone benchFishing rodCampfireMailboxWooden stepsRustic doorSloped stone roofStone roof decorationCardboard boxesOffice chairComputerOffice deskPortal podOffice lockerOffice shelfFluorescent lightGlass paneStylish doorFolding chairWhiteboardKitchen tableMicroscopeBook pileLanternWooden stoolWooden tableRecycling binWall-mounted toolsPencil holderArched barrierPlain chairWall-mounted tableGarden benchGyarados fountainWooden gateGlossy awningSubstitute dollUnderground hatchPlain sofaPop art bedPop art chairSimple cushionDecorative clothCycle shop signBikeToolboxIron rackMagazine rackLarge boulderSignWooden ladderStepping stonesTorchStraw stoolWall torchRailway trackCrystal clusterOffice tableWall calendarSide tableServersAudio mixerControl unitSmall garbage canMirror ballSubmarine doorJumbled cordsSmall square rugIron bedSubmarine windowChic sofaCorkboardSpeakerMarine closetResort sofaPlain tablePlain stoolResort stoolSeashell fencingCute bedMarine dresserMarine chairClefairy doll
What the Poké Balls hold 15

the Poké Balls scattered about the area open on these

Marine chairrecipeWall plantSand toysSand den kitNettingrecipeHeat RockImperial house kitOrnate decorative shelfWatermelon seedsLampionTabletop micOcean pals rugColorful anchor print (wallpaper)recipeBig NuggetSecurity poster
Treasure you can dig up 15

what a treasure map digs up here

Large lost sunken relicSmall lost relicLarge lost relicSubstitute DollStarmie dollDitto dollThe SeaViolet CityDiveCanalave City (Night)Undella Town (Summer)Lumiose CityPo TownStow-on-SideHotel Z
From the fishing spots 10

Sparkling Ripples, which Bubbly Basin calls Whirlpools

Watermelon seedsSeabed flower seedsStar-spotted rockGrubby pearlSea glass fragmentsPokémetalRare PokémetalImperial cottage kitImperial house kitWaterwheel kit

Shop unlocks by Environment Level

71
LevelUnlocks
Lv. 2
Marine tableMarine chairSand toysSubmarine kitBuoyant blockrecipeGlossy tilingrecipeCarved blue rockrecipeSeabed flower seeds
Lv. 3
ToolboxLampionMarine closetCushion bedGrubby pearlClock tower kitAqua cottage kitMarine dresserrecipeSandpilerecipeSeashell fencingrecipeFloating logsrecipeWatermelon seeds
Lv. 4
Bottled shipSparkling jewelryImperial cottage kitLaboratory kitPearl streetlightrecipePointed wooden fencingrecipeSloped scale roofrecipeScale hipped roofrecipeScale roof valleyrecipeFlat scale roofrecipeScale roof decorationrecipeScale awningrecipe
Lv. 5
Teaware setBook stackChain lampImperial house kitSupermarket kitMarine closetrecipeMarine tablerecipeLacquered wallrecipeGradient wall (wallpaper)recipe
Lv. 6
Supermarket signOrnate chairrecipeBubble machinerecipeOrnate doorrecipeMetal wallrecipePathway light (line)recipePathway light (single)recipePathway light (corner)recipeOcean pals rug
Lv. 7
Rare PokémetalOrnate tablerecipeWavy-pattern planterrecipeOrnate windowrecipeOrnate wallrecipe
Lv. 8
Ornate bedrecipeSubmarine doorrecipeSubmarine windowrecipeHatchrecipeGradient wall (upper)recipeGradient wall (lower)recipe
Lv. 9
HarpOrnate standrecipeOrnate partitionrecipeRectangle tilingrecipe
Lv. 10
Ornate decorative shelfrecipeStone-accent wallrecipeStately flooringrecipeStately wall (upper lower)recipeStately wall (middle)recipeBasin Pokémon Center kitrecipe

Raising an area’s Environment Level puts new stock in its shop. An entry marked “recipe” unlocks the crafting recipe rather than the item; click any of them to open its entry.