Question: how do you get to the ss anne in pokemon let's go pikachu?
Answer: With the S.S. Anne tickets, return to Vermillion City and make your way South to the port where the ship is docked. Show your tickets to the Sailor right outside the ship and you'll get a free Sailor Outfit Set for you and your Pokemon (Eevee or Pikachu) to wear. After that, you can board the ship and begin exploring.