Question: pokemon let's go pikachu how to catch mewtwo?
Answer: Mewtwo. Unlike the other legendary Pokémon, you have to beat the Elite Four before you can nab Mewtwo. Once you beat the game, your rival will tell you about a cave near Cerulean City. To get to Cerulean Cave, go up the bridge on the north side of the city and then Sea Skim in the water to the left.