Question: what happens after you beat the elite four in pokemon let's go?
Answer: If you challenge the Elite Four again and reenter the Hall of Fame, Green will show up for a rematch, this time near the fountain in Cerulean City. Red will arrive on the scene once you've bested six Master Trainers. Meet that milestone, and he'll be waiting for you on the Indigo Plateau. His six Pokémon are all Lv.