Larvitar

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 Stone stuff

97+ items

StoneLuxury chairStone benchLuxury bedLuxury dresserMugTable settingSmall vaseLeafy plantPitcher-plant potExtravagant flowersTall potted plantFlat-leaf plantMunna bankPencil holderStone fireplaceDining cabinetToiletSinkBathtubGold TeethBig NuggetMysterious statueFiery Magby statueGym emblem statueSpacesuitModel space shuttleSpaceshipDecorative storage shelfCampfireSlender candleEerie candleWall torchFirepitConcrete pipeGarden ornamentGravestoneHorsea fountainSignpostInformation boardDitto FlagSprinklerModel planetLuxury lampShell lampStone tiling (wallpaper)Stone flooring (wallpaper)Stone brick wall (wallpaper)Light ClaySkull FossilArmor FossilJaw FossilSail FossilWing Fossil (head)Wing Fossil (right wing)Wing Fossil (left wing)Wing fossil (body)Wing Fossil (tail)Headbutt Fossil (head)Headbutt Fossil (body)Headbutt Fossil (tail)Shield Fossil (Head)Shield Fossil (body)Shield Fossil (tail)Despot Fossil (head)Despot Fossil (body)Despot Fossil (legs)Despot Fossil (tail)Tundra Fossil (head)Tundra Fossil (body)Tundra Fossil (tail)Stone brick wallStone pillar (upper)Stone pillar (middle)Stone pillar (lower)Stone flooringStone tilingStone stepsStone hipped roofStone roof valleyStone roof decorationStone debrisMetal DebrisJewel wall decorationTreasureMarine chestMarine closetOrnate standSeashell seatMarine chairOrnate chairOrnate bedDecorative platesParty ballGyarados fountainPrimarina statueStone sign

2 Lots of dirt

38+ items

Red paintBlue paintGreen paintYellow paintPink paintCyan paintWhite paintBlack paintSandboxPunching bagSandbagsWheelbarrowSkull FossilArmor FossilJaw FossilSail FossilWing Fossil (head)Wing Fossil (right wing)Wing Fossil (left wing)Wing fossil (body)Wing Fossil (tail)Headbutt Fossil (head)Headbutt Fossil (body)Headbutt Fossil (tail)Shield Fossil (Head)Shield Fossil (body)Shield Fossil (tail)Despot Fossil (head)Despot Fossil (body)Despot Fossil (legs)Despot Fossil (tail)Tundra Fossil (head)Tundra Fossil (body)Tundra Fossil (tail)MudRunning shoesSand bedBeach volleyball set

3 Luxury

61+ items

Antique chestAntique closetPolygonal ShelfAntique tableChic tableLuxury tableChic chairFancy chairAntique chairLuxury chairGaming chairChic sofaAntique sofaLuxury sofaGuest-room bedAntique bedLuxury bedCute bedWall mirrorLarge mirrorAntique dresserLuxury dresserTable settingAfternoon tea setFancy penStone fireplaceDining cabinetBig NuggetAuspicious ArmorMalicious ArmorAntique clockSlender candleEerie candleFirepitChansey plantBellPoké Ball lightPoké Ball lampLuxury lampMirror ballAntique chandelierRainbow FeatherSilver FeatherJump rope trophyJewel wall decorationTreasureHide-and-sneak trophyOrnate standOrnate tableOrnate chairOrnate bedTeaware setDecorative platesOrnate decorative shelfSparkling jewelryMusic boxHarpParty ballGyarados fountainPrimarina statueLampion

4 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

5 Looks like food

26+ items

Berry caseBerry tableBerry chairBerry bedTable settingPizzaFried potatoesSoda floatAfternoon tea setChocolate cookiesSandwichesShaved iceRibbon cakeBerry basketBerry clockBerry wall decorationBerry table lampBerry hanging lampBerry print (wallpaper)LeftoversRoom ServiceBerry printLunch boxJuice trioTeaware setWall plant

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.