This pack is for just that kind of scenario- every available item sprite in SwSh, Essentials-formatted and ready to go! Pick your folder, drag it into Graphics/Items (or Graphics/Icons if you're prior to v19), and replace all the files there!
It's broken down into a few folders- there's v18 and v19 file naming, and within those two, you can choose between having your items on a 48x48 canvas (like in default Essentials) or the bigger 64x64 canvas that started being used when Pokemon moved to the 3DS. (Well, technically, 24x24 and 32x32, but they have to be upscaled for Essentials) The 64x64 packs will have all possible sprites included, but you may need to make the UI a bit bigger for sprites like the Forage Bag:
By contrast, the 48x48 sprites should all fit nicely into the vanilla UI and and any other UI using that size window, but a few sprites were tweaked to fit the smaller canvas, and some sprites are missing entirely.
Where applicable, everything is named with its internal name (v19) or id number (versions prior), but there's a few hundred items that aren't already coded into Essentials- those are in a little subfolder labelled "Not in PBS".
There's also a pack of 24x24 held item icons put together by AiurJordan! You can find them here! You'd put that pack in Graphics/Pictures/Party!
All my little notes:
The following items are all absent from SwSh, even after datamining:
- Gen 4's Mail (was replaced with Gen 5's mail)
- Old Sea Map
- The original designs for the item finder/dowsing machine (the one from ORAS exists, but it’s vastly different)
- Aurora Ticket
- The blue Xtransceiver
- The silver Travel Trunk
The following items were redesigned at some point since Gen 3, so there's no SwSh version of the sprite in vanilla Essentials:
- Moomoo Milk (Gen 4)
- Bike (Gen 6)
- Old Rod (Gen 6)
- Good Rod (Gen 6)
- Super Rod (Gen 6)
- Devon Scope (Gen 6)
- Blue Orb (Gen 6)
- Red Orb (Gen 6)
- Poke Flute (Gen 7)
- Lost Item (Gen 5, even though it wasn’t used then)
- Lock Capsule (Gen 5)
- Silver Wing (not sure when it was changed)
- Adventure Rules (Gen 8)
- Sparkling Stone (USUM)
- Old Rod
- Good Rod
- Super Rod
- Safety Goggles
- Terrain Extender
- Elevator Key
- Honor of Kalos
- Strange Souvenir (it looks very different with my edit, though)
- Acro Bike
- Go-Goggles
- Reins of Unity
- Mark Charm
- Gigantamix
- Precooked Burger
- Spice Mix
- Hi-Tech Earbuds
- Wishing Piece
- Mints
- Utility Umbrella
- Room Service
- Heavy Duty Boots
- Eject Pack
- Fossilized Dino
- Fossilized Drake
- Fossilized Fish
- Fossilized Bird
- Jaw fossil
- Sail fossil
- All Seeds
- Prison Bottle
- Pokeblock Kit
- ORAS Dowsing Machine
- Adventure Rules
- Looker Ticket
- Roller Skates
- TMV Pass
- Discount Coupon
- Travel Trunk
- Scuba Gear
- Contest Costume M
- Galarica Wreath
- Legendary Clue
- Crown Pass
- Wooden Crown
- White Mane Hair
- Blake Mane Hair
- Iceroot Carrot
- Shaderoot Carrot
- Dynite Ore
- Carrot Seeds
- Max Honey
- Max Mushrooms
- Sonia’s Book
- Rotom Catalogue
- Galarica Twig
- Galarica Cuff
- Style Card
- Armor Pass
- Exp Charm
- Rotom Bike
- Old Letter
- Pots
- Camping Gear
- Fried Food
- Brittle Bones
- Endorsement
- Fishing Rod (Gen 7 and Gen 8)
- Bob’s Food Tin
- Bach’s Food Tin
- Pewter Crunchies
- Forage Bag
- Z-Power Ring
- The full-size Z-crystals (the held size are still fine)
- Credits
- Sprites were ripped by RandomTalkingBush of spriters-resource
You can credit TechSkylander1518 if you really want, but honestly all I did was save the sprites.
The held item icons were made by AiurJordan