Where can I find a mystery box in Pokémon Go? I saw the news about the upcoming event involving shiny Meltan and want one, but I don’t have a mystery box.
You can't just find that box in PoGo, you need to trade with a Pokémon Let's Go account to get it. If you don't have it and don't know anyone who does either, you'll be able to get a single Meltan from the Special Study I imagine - I haven't completed it myself, but like other Special Studies (Mew, etc.) it should provide you with one Pokémon to catch and a bunch of Candy. Since Meltan requires 400 Candy to evolve though, it's going to be a pain to evolve it without the Mystery Box.