Last but not least, every brand new Poké Ball Plus comes with the Mythical Pokémon inside. Currently, there is no other way to obtain a in Let’s Go. For those wondering, you cannot transfer a from Pokémon GO to Let’s Go, to get that way.
To obtain , you need to be playing the game with the Poké Ball Plus. You must also be connected to the Internet. Open the main menu and choose the Communications menu, then “Mystery Gift”. If done correctly, a “Get with a Poké Ball Plus” option should appear. Select this.