Weezing

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 Garbage

16+ items

Nonburnable garbageWastepaperSmall garbage canJumbled cordsGrubby letterGrubby notepadGrubby bookGrubby papersGrubby newspaperGrubby tabletGrubby cell phoneGarbage bagsGarbage binRecycling binNonburnable garbage (outdoor)Black Sludge

2 Gatherings

46+ items

Office shelfTea setTable settingPaper Party cupsFried potatoesAfternoon tea setChocolate cookiesSandwichesPencil holderCorkboardCD rackMagazine rackDining cabinetBathtime setToy blocksPinwheelsKnitting suppliesScience experimentJumbled cordsBalloonsCardboard boxesWhiteboardDecorative bookshelfDecorative storage shelfDecorative plant shelfBerry wall decorationGarden ornamentPhoto cutout boardGarbage bagsSandbagsTiresConstruction suppliesIron pipesGaming lightString lightsFlowery table settingLunch boxJuice trioFlower garlandJewel wall decorationStar wall decorationDecorative platesBook stackShop display caseOrnate decorative shelfWall plant

3 Complicated stuff

40+ items

Pencil holderFancy penLetterNotepadBookOpen BookPapersNewspaperCD rackMagazine rackMini bookcaseBookcasePrinterComputerMicroscopeScience experimentJumbled cordsAudio mixerWhiteboardControl unitSpacesuitWall CalendarAntique clockRowlet clockGrubby letterGrubby notepadGrubby bookGrubby papersGrubby newspaperGrubby tabletBikeMenu boardSignpostInformation boardCash registerMini generatorCard readerTown mapTeam Rocket Wall HangingDigital camera

4 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

5 Wobbly stuff

20+ items

Folding chairResort hammockKnitting suppliesBalloonsPunching gameWobbuffet WobblerHanging bannerBerry wall decorationPunching bagBellFishing rodSilk ScarfLagging TailInflatable SudowoodoMoon clockMetronomeChimecho wind chimeHanging signChain lampBeach volleyball set

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.