The ability to transfer Pokémon caught in Pokémon GO was a heavily advertised feature, and we suspect it’s a very popular one as well. The process itself is fairly simple, but there are a number of steps, and a few important things to know.
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Firstly, only Pokémon originally discovered in the Kanto region can be transferred to Let’s Go. With the exception of Mew. So that means Pokémon with Pokédex numbers between 1 and 150. Shiny Pokémon and Alolan Forms are eligible, but event Pokémon with hats and sunglasses aren’t.
In addition, the two brand new Mythical Pokémon, #808 Meltan and #809 Melmetal, can also be transferred. In fact, the only way to obtain these two in Let’s Go is by transferring from GO.
Secondly, transferral of Pokémon occurs in a special facility in Fuchsia City, called the GO Park Complex. That means you need to have played past the halfway point before you can start transferring Pokémon. So you can’t wreck Brock and Misty with your shiny Charizard or Dragonite, etc.
Last but certainly not least, when you transfer Pokémon from GO to Let’s Go, the Pokémon cannot return to GO. It is essentially a one-way trip. So think carefully before you transfer any important Pokémon. If in doubt, only transfer spares, and keep your strong Pokémon for raids, Gym battles etc.