Question: pokemon let's go pikachu how to get rainbow badge?
Answer: Pokémon Let's Go: Celadon City Gym and Erika Gym Battle. You need to have a 'cute' Pokémon to enter Erika's Gym, which is accessed by chopping down the tree in the bottom-centre of Celadon City and working your way along the lower path. Your partner Pikachu or Eevee will do!