I'm trying to evolve a galar slowpoke into either g.slowking or g.slowbro but the evolution items aren't in the game. Is it possible to evolve them here or does it have to be done in sword and shield?
You need to transfer Galarian Slowpoke to Pokémon Sword & Shield to evolve it at this time
Source
The list I provided to Serebii is on his website here: https://serebii.net/scarletviolet/auctions.shtml No Galarica Cuff / Galarica Wreath at all.
As of now, the only way to evolve Galarian Slowpoke is inside of Sword and Shield, using the Galarica Cuff or Galarica Wreath. These two items will probably be featured in a future event or in the DLC.
Hope this helped!
You will need a Galarica Cuff (for slowbro) or a Galarica Wreath (for slowking). To get these you will need to gather Galarica twigs, which are scattered around the costal biome as items. Then you can talk to an NPC in the Costal Plaza, right beside the vending machines. She will can make either, it’s 8 for a cuff and 15 for a wreath!
Source: https://game8.co/games/Pokemon-Scarlet-Violet/archives/413495
