Pokémon Sword and Shield have Galarian Slowpoke joining the game as a free update. There’s a specific way to evolve this unique Slowpoke to have it evolve into a Galarian Slowbro.
First, you need to make sure your game has updated on your Nintendo Switch to add Galarian Slowpoke to the game. After the update, fly over to Wedgehurst station in the town between routes 1 and 2. Walk inside of the station to activate the event to receive the Pokémon. If you have Sword you’ll talk to Klara, and if you have Shield you’ll speak to Avery. The Galarian Slowpoke walks in during the exchange. You’ll have the chance to battle it and then catch it.
Now that you have Galarian Slowpoke on your team, the Galarian Slowbro evolution is next on your list. It’s a Psychic and Poison-type Pokémon. You will need an item you can exclusively receive from The Isle of Armor region called the Galarica Cuff. You can receive it by speaking to a woman on the small island listed below.
The woman will offer to trade you for a Galarica Cuff if you are willing to give up 8 Galarica Twigs for it. You can find these twigs all over The Isle of Armor as the shiny objects on the ground. When you have enough, head over to this island and speak to her about it. Plus, if you talk to her with a Galarian Slowpoke in your party, she will give you a shirt for free.
Once you receive the item, have your chosen Slowpoke hold it and it will evolve into a Galarian Slowbro.