Description
Green, a Pokémon Trainer from Kanto driven to complete the Pokédex by capturing Mewtwo, surveys Cerulean Cave through binoculars from Nugget Bridge. Spotting Trace entering the cave with the same goal, she pursues but is halted by five Trainers guarding the bridge. Green battles them simultaneously using Gengar and Kangaskhan, defeating them before proceeding.

Navigating Cerulean Cave's hazards, Green employs Blastoise to cross waterways and Victreebel to swing across gaps. She encounters Trace and assists him by dispersing a Zubat and Golbat swarm with Victreebel's Razor Leaf. Trace thanks her but warns others also seek Mewtwo.

In the cave's depths, Green mistakes Elaine for a Pokémon in the darkness and tosses a Poké Ball. Discovering Elaine has already captured Mewtwo, Green challenges her to battle. She deploys Clefable, defeated by Elaine's Pikachu using Zippy Zap. Green then sends out Ninetales against Elaine's Rapidash, overpowering it with Flamethrower. Insisting Elaine reveal Mewtwo, Green Mega Evolves Blastoise and attacks with Hydro Pump. Mewtwo blocks with Protect, counters with Psychic, and defeats Blastoise with Aura Sphere. After her loss, Green offers Elaine Mewtwonite X and Mewtwonite Y, then jokingly suggests Elaine and Mewtwo become her Pokémon.

Later, Green reports her failure to complete the Pokédex to Professor Oak at his Pallet Town laboratory, with Trace and Elaine present. Oak reassures her that her efforts contributed to the collective project alongside theirs, emphasizing the bonds she formed with her Pokémon. As Oak receives news of newly discovered Steel-type Pokémon, confirming the Pokédex remains incomplete, Green departs with Trace and Elaine, sharing a smile as they walk toward new destinations.

Green's known Pokémon include Kangaskhan and Gengar, used against the Nugget Bridge Trainers; Victreebel, employed for traversal and repelling bat swarms; Clefable and Ninetales, deployed against Elaine; and Blastoise, her primary partner capable of Mega Evolution.