Question: how to evolve meltan in pokemon let's go pikachu?
Answer: 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.