Slowpoke is the only Pokemon in the sword Y Sign Extension, Isle of Armorto get a new form of Galar.
You can find the yellow-headed Pokemon roaming the beaches of the Isle of Armor. To make it a Galar Slowbro you need a Galarica Bracelet. These can be obtained from a female NPC sitting on an island in the Training Sea. You trade 8 Galarica Branches for a Galarica Bracelet.
Galarica Twigs appear as a hidden item under trees on the Isle of Armor. You will be able to see bright spots on the floor. Press A in front of the sparkles to pick up the item. While you can find other items this way, it will eventually lead you to many Galarica branches.
If you’ve caught the Galarian Slowpoke at the train station without purchasing the Expansion Pass, you won’t be able to evolve it unless a real-world friend snags a Galarica Armguard for you when you’re playing the Pack expansion.
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Source : polygon.com