Green (game)/Games/NPC

Green makes an appearance in Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!. She's first mentioned by after the undefined has become Champion as a girl looking to  a powerful Pokémon spotted in Cerulean Cave. After the player has caught in Cerulean Cave and exited the cave, Trace will appear again and mention how the girl looking for Mewtwo had entered the cave earlier. Green can then indeed be found inside Cerulean Cave, at the same spot where Mewtwo was earlier. When first interacted with, she will toss a at the player, having mistaken them for a Pokémon. Upon learning that the player managed to catch Mewtwo before her, she immediately challenges them to a battle. After being defeated, she will hand the player both of Mewtwo's Mega Stones: Mewtwonite X and Mewtwonite Y. She will then ask the player to become one of her Pokémon, along with Mewtwo, and throws several Poké Balls at them, attempting to catch them like a Pokémon. After failing in doing so, she runs away, asking the player to consider her offer.

Green can later be re-encountered in Cerulean City, where she will challenge the player to a rematch. After being defeated again, she once again tries to catch the player in a Poké Ball, but fails once again, and runs off once more, swearing to not give up on trying to get the player and Mewtwo for herself. This rematch can be repeated once per day.