Corviknight

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 Nice breezes

9+ items

FanAir conditionerPinwheelsTidal BellModel space shuttleCeiling fanWeather vaneLarge ventilation fanChimecho wind chime

2 Metal stuff

171+ items

Copper oreIron oreGold orePokémetal fragmentRare Pokémetal fragmentCopper ingotIron ingotGold ingotPokémetalRare PokémetalOffice cabinetGaming fridgePoké Ball ChestOffice lockerOffice shelfIron standIndustrial deskIron tableOffice deskIndustrial chairIron chairPublic seatSpectator chairLuxury chairGarden chairFolding chairOffice chairGaming chairIron benchIndustrial benchGarden benchPoké Ball SofaIron bedPoké Ball bedIndustrial bedTable settingSmall garbage canFancy penModern sinkCooking stoveMicrowave ovenRefrigeratorFanAir conditionerWashing machineShowerTabletCell phoneLaptopComputerGaming PCTelevisionWall monitorArcade machineAlarm ClockGame Boy systemFunky diffuserFirst aid kitMicroscopeScience experimentJumbled cordsTabletop micStanding micBig drumCool electric guitarCool bass guitarAudio mixerSpeakerGold TeethRepelBig NuggetStep stoolControl unitAuspicious ArmorMalicious ArmorClear BellTidal BellShip's WheelSpacesuitModel space shuttleSpaceshipCeiling fanGrubby tabletGrubby cell phoneWall torchFirepitPunching bagVending machineBikeMailboxWeather vaneCannonBellSmall stageFishing rodSignpostInformation boardRaichu signBarrelGarbage binRecycling binFire hydrantExcavation toolsMetal drumConstruction suppliesIron pipesWheelbarrowLarge ventilation fanCash registerSprinklerMini generatorCard readerTown streetlightHarbor streetlightChic streetlightDouble streetlightDesk lightPoké Ball lightModel planetGarden lightLanternSeedot LampMirror ballPop art lampSpotlightAntique chandelierIron-plate flooring (wallpaper)Team Rocket Wall HangingIron wallIron-plate flooringIron depositIron stepsIron ladderMetal chainIron doorIron gateCorrugated metalMetal DebrisMetal fragmentsHoppip water bottleJump rope trophyCamping chairDigital cameraTreasureOil lanternTelescopeCloud cannonHide-and-sneak trophyDecorative Poké BallShop shelfShop fridgeSparkling jewelryMetronomeHarpDecorative Great BallDecorative Heal BallDecorative Quick BallDecorative Dive BallDecorative Net BallDecorative Lure BallWindup InkayToolboxServersDecorative shop shelfWall clockWall-mounted toolsSand toysHanging signSlim information boardDangling streetlightChain lamp

3 Shiny stuff

77+ items

Crystal fragmentStardustGaming fridgeGaming chairGaming bedMunna bankBathtime setCleaning suppliesTabletCell phoneLaptopComputerGaming PCTelevisionWall monitorCrystal ballTabletop micStanding micGold TeethBig NuggetAuspicious ArmorClear BellGym emblem statueSpacesuitModel space shuttleBellSignpostInformation boardRaichu signFire hydrantMini generatorMushroom streetlightChic streetlightPoké Ball lightPoké Ball lampRed meteor lampOrange meteor lampYellow meteor lampGreen meteor lampBlue meteor lampIndigo meteor lampViolet meteor lampMirror ballFluorescent lightGaming lightString lightsMusic 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)Star PieceNuggetSilver Bottle CapGold Bottle CapMetal PowderClear AmuletRainbow FeatherSilver FeatherRed crystal fragmentDigital cameraStar closetStarry-sky bedStar-shaped DresserStar wall decorationJirachi lampMarine chestMarine closetOrnate decorative shelfSparkling jewelryDangling streetlightCursola lightDecorative clothPrism scale

4 Containers

81+ items

Wall storage boxPlain chestOffice cabinetGaming fridgePoké Ball ChestBerry caseAntique chestPlain closetOffice lockerAntique closetOffice shelfPolygonal ShelfPlain standIron standAntique dresserLuxury dresserCute dresserPicnic basketMugTea setPaper Party cupsBerry basketSmall vaseLeafy plantPitcher-plant potExtravagant flowersTall potted plantFlat-leaf plantTwisted potted plantSmall garbage canMunna bankPencil holderPhoto frameWall photo frameCD rackMagazine rackMini bookcaseBookcaseDining cabinetRefrigeratorWashing machineBathtime setCleaning suppliesKnitting suppliesFirst aid kitJumbled cordsCD playerBoo-in-the-boxCardboard boxesWooden birdhouseMailboxWater basinWorn wooden crateWooden crateBarrelGarbage binRecycling binMetal drumConstruction suppliesWheelbarrowFrameCash registerFlowery table settingLunch boxHoppip water bottleJuice trioFlower backpackAdventure kitOil lanternStar closetStar-shaped DresserMarine chestMarine closetOrnate standShop display caseShop shelfShop fridgeToolboxWall plantParty ballBlender

5 Wooden stuff

57+ items

Sturdy stickSmall logLumberStorage boxWall storage boxBig storage boxPlain chestOffice cabinetAntique chestPlain closetAntique closetLog tablePlain standFood counterPlain tableAntique tableStudy deskLog chairPlain stoolResort stoolStylish stoolWooden stoolPlain chairResort chairChic chairPlain sofaResort sofaChic sofaAntique sofaLog BedMini plain bedGuest-room bedWooden plateCD rackMagazine rackMini bookcaseBookcaseDining cabinetToy blocksWreathAntique clockSlideWater basinArrow signMenu boardSignWorn wooden crateWooden crateBarrelFrameCutting boardMushroom lampStone fragmentsStar closetMusic boxHarpStanding frame

Flavour: bitter

11 foods

Rawst BerryPotatoSeaweedSeaweed saladSeaweed soupRecycled breadBitter hamburger steakSea grapesPopping saladPopping soupCoffee parfait 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.