The original protagonist of the Pokemon series is known simply as Red. He is still known as a legend in Pokemon Let’s Go Pikachu and Let’s Go Eevee, and has the strongest team in the entire game, with move sets similar to the first generation. Items cannot be used throughout the battle, so be sure your Pokemon are up for the challenge!
You can challenge Red to a Pokemon battle after defeating six Master Trainers throughout Kanto. He can then be found standing to the left of the Pokemon League entrance atop the Indigo Plateau. After the battle, he will disappear until you defeat the upgraded Pokemon League with the Elite Four and your Rival.