Question: what do you do after you beat the elite four in let's go?
Answer: 30 Things to Do After Beating Pokémon: Let's Go Pikachu and Eevee. ...  Challenge All 153 Master Trainers. ...  Play at the Go Park. ...  Collect All the Mega Stones. ...  Explore Cerulean Cave. ...  Catch Mewtwo. ...  Fly in the Sky with Your Pokémon. ...  Re-Challenge the Gym Leaders.