Nintendo Pokemon Let's Go Pikachu! for Nintendo Switch - Free Region

There is a deep connection between Pokémon GO and Pokémon: Let’s Go, Pikachu! Pokémon originally discovered in the Kanto region that you have caught in Pokémon GO can be brought into these two new Nintendo Switch games.
The GO Park complex is where your Pokémon will arrive after you've synced your Pokémon GO game with Pokémon: Let's Go, Pikachu! or Pokémon: Let's Go, Eevee! There, you'll be able to see your Pokémon friends running around and having fun!
The GO Park complex has a total of 20 GO Parks, with each capable of holding 50 Pokémon. That's a whopping 1,000 Pokémon that you can keep! If you want to explore the Kanto region with the Pokémon you've brought over from Pokémon GO, you'll need to catch them again in the GO Park complex first.
You'll find the GO Park complex in Fuchsia City, which you reach by progressing through the story. While in a GO Park, you'll be able to observe your Pokémon gathering together and playing. Watch closely, and you might even see the Pokémon having conversations with each other.