Meltan and Melmetal can finally be added to Pokemon Sword and Shield today thanks to Pokémon Home, even if the method to get the Pokémon into the game is tedious.
Meltan is easy to obtain in Pokémon Go, but trainers are looking for easy ways to get it to evolve to Melmetal. There’s no method to evolve the Pokémon on Nintendo Switch similar to Let’s Go, but there is a way to get Melmetal.
The only way to get a Melmetal is through Pokémon Go by getting 400 Candies to evolve Meltan.
Then you need to transfer the Melmetal into Pokémon: Let’s Go, transfer it to Home, and finally pass it along to Pokemon Sword and Shield through Home.
It’s obviously not ideal and a little time-consuming, but that’s the only way to do it at this time. There might be a way to evolve it in the future DLC expansions, but right now, you might need to wait weeks to get enough candy in Pokémon Go to get Melmetal in the first place.