Question: how many pokemon can you transfer to let's go?
Answer: You can select up to 50 Pokémon at a time to transfer to your Pokémon: Let's Go, Pikachu! or Pokémon: Let's Go, Eevee! game. Only the Pokémon you've caught in Pokémon GO that were originally discovered in the Kanto region (as well as their Alolan variants) may be transferred.