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It has become clear that Meltan will only evolve into Melmetal in Pokémon GO. To evolve it, you will need 400 Meltan Candies.Just as with the Candies you collect for other Pokémon, you’ll be able to get Meltan Candies by doing things like catching Meltan, sending it to Professor Willow, or having Meltan travel around with you as your Buddy Pokémon.
You’ll also get these Candies when you send Meltan from Pokémon GO to Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee! Plus, you’ll also be able to use some other handy shortcuts to speed up this Evolution, such as getting more Meltan Candies by trading with friends or using Rare Candies to help you along the way.
