Take your Pokémon journey to the Kanto region with your energetic partner, Pikachu, to become a top Pokémon Trainer as you battle other trainers.

Use a throwing motion to catch Pokémon in the wild with either one Joy-Con controller or Poké Ball Plus accessory, which will light up, vibrate, and make sounds to bring your adventure to life. Share your adventure with family or friends in 2-player action using a second Joy-Con or Poké Ball Plus (sold separately). You can even connect to the Pokémon GO app using a compatible smartphone to bring over Pokémon originally discovered in the Kanto region!

Explore the diverse and vibrant region of Kanto! True-to-size wild Pokémon roam around in the game, so catch them like a real Pokémon Trainer by using motion, timing, and a well-placed Poké Ball™. Go on a stroll with your favorite Pokémon in your Poké Ball Plus! Connect your game directly to Pokémon GO to receive Kanto region Pokémon.

• Become a top Pokémon Trainer on an adventure with Pikachu!
• Encounter Pokémon in the Kanto region
• Play the entire game with a single Joy-Con controller or use the Poké Ball Plus accessory, which will light up, vibrate, and make sounds to bring your adventure to life
• Take your Pokémon for a stroll in your Poké Ball Plus
• Play a Pokémon adventure together cooperatively anytime, anywhere on one system by using another Joy-Con controller or Poké Ball Plus accessory (sold separately) to catch and battle alongside another player!
• Use Poké Ball Plus to connect with the Pokémon GO app on compatible smartphones to catch Kanto region Pokémon

Source: https://www.nintendo.com/games/detail/pokemon-lets-go-pikachu-switch