Igglybuff

A habitat matching this ambience raises Comfy Level faster. Time and weather gate whether a Pokémon turns up at a habitat at all — though light overrides the clock: a night Pokémon spawns at any hour if its habitat sits somewhere dark such as a cave or underground, and a day Pokémon spawns at night if its habitat is ringed with light.

Give or place anything matching these and both friendship and Comfy Level rise much faster — a matching item lays down with a bigger sparkle. For a Pokémon with the Trade specialty, matching items are also worth 50% more on the scale.

1 Soft stuff

77+ items

Squishy clayFluffStraw stoolBerry chairSimple cushionPlain stoolResort stoolStylish stoolSoft seatBox SofaPlain chairResort chairChic chairFancy chairAntique chairOffice chairCute chairPop art chairGaming chairPlain sofaResort sofaChic sofaAntique sofaLuxury sofaCute sofaPop art sofaPikachu sofaLog BedMini plain bedResort bedIron bedBeach chairStraw bedPop art bedPoké Ball bedBerry bedWooden BedPlain bedResort hammockGuest-room bedAntique bedIndustrial bedLuxury bedCute bedGaming bedNaptime bedTowel rackKnitting suppliesEevee dollPikachu dollClefairy dollDragonite dollDitto dollSubstitute dollTire toyInflatable boatSoft SandLight ClayCotton SporesFlower cushionFlowery table settingFlower garlandFlower backpackCamping chairSleeping bagAdventure kitStarry-sky bedSeashell seatOrnate chairMarine sofaOrnate bedCushion bedRunning shoesStarmie dollSand bedSwim ringBig swim ring

2 Cute stuff

80+ items

Poké Ball ChestBerry casePolygonal ShelfCute tablePop art tableBerry chairStylish stoolCute chairPop art chairCute sofaPop art sofaPikachu sofaPop art bedBerry bedCute bedNaptime bedCute dresserWiggly mirrorRibbon cakeMunna bankBathtime setBouncy blue bathtubBoo-in-the-boxWobbuffet WobblerBerry clockRowlet clockCastform weather charmEevee dollPikachu dollClefairy dollArcanine dollDragonite dollDitto dollSubstitute dollEerie candleChansey plantInflatable boatPhoto cutout boardBerry table lampCute lampModel planetRed meteor lampOrange meteor lampYellow meteor lampGreen meteor lampBlue meteor lampIndigo meteor lampViolet meteor lampLuxury lampSeedot LampShell lampBerry hanging lampCute flowerHeart ScaleFairy FeatherFlower cushionFlowery table settingLunch boxHoppip water bottleFlower garlandFlower backpackStar closetStarry-sky bedStar-shaped DresserMoon clockStar wall decorationJirachi lampSeashell seatMarine sofaCushion bedDecorative platesWindup InkayChimecho wind chimeRunning shoesStarmie dollPrimarina statueCycle shop signCafé signGift shop signCursola light

3 Play spaces

27+ items

Bathtime setArcade machineToy blocksPinwheelsStanding micBig drumBalloonsPunching gameBoo-in-the-boxWobbuffet WobblerSandboxTire toySlideSmall stageMusic mat (low do)Music mat (Re)Music mat (Mi)Music mat (Fa)Music mat (Sol)Music mat (La)Music mat (Ti)Music mat (High do)Windup InkaySand toysGyarados fountainSand bedBeach volleyball set

4 Healing

4+ items

HumidifierFirst aid kitThroat SprayShop shelf

5 Noisy stuff

27+ items

Alarm ClockCD playerTabletop micStanding micBig drumCool electric guitarCool bass guitarSpeakerClear BellTidal BellAntique clockBerry clockMusic mat (low do)Music mat (Re)Music mat (Mi)Music mat (Fa)Music mat (Sol)Music mat (La)Music mat (Ti)Music mat (High do)Cloud cannonMetronomeMusic boxHarpWindup InkayChimecho wind chimeBlender

Flavour: sweet

10 foods

Pecha BerryBeanLeppa saladFluffy breadPotato hamburger steakMoomoo Milk CoffeeWatermelon sliceWatermelon smoothieWatermelon breadLeppa smoothie

Two caveats. The game lists these five in a fixed order, but no source says the first counts for more than the fifth — the numbers are the in-game order, not a strength ranking. And the item lists are incomplete: Serebii marks them as still being filled in, so each count is a floor, not a total.