Ash and his mother had taken in Mewtwo after the powerful Pokémon had suffered a brutal attack, leaving him injured and vulnerable. Though wary of humans, Mewtwo had no choice but to trust Ash and Delia as they nursed him back to health in the quiet outskirts of Pallet Town.

One day, after a few weeks of recovery, Mewtwo began to feel restless. His desire to explore the world grew stronger. Ash, always eager for adventure, offered to take him out into the wilderness. Together, they traveled through dense forests and across open plains, the bond between Ash and Mewtwo growing stronger with every step. Mewtwo, despite his innate caution, began to appreciate Ash's unyielding kindness and bravery.

As they reached a secluded valley, Mewtwo's psychic senses began to tingle. There was another presence—one that felt eerily familiar yet... different. Intrigued, Mewtwo led Ash deeper into the valley until they came across something extraordinary: another Mewtwo, standing atop a hill, staring down at them.

This Mewtwo, however, was different from the one Ash had grown to know. Her cream-colored fur had a faint green tint, almost like she was connected to the earth in some mystical way. Her tail, a vibrant lime green, swayed gently in the breeze as her piercing green eyes locked onto Mewtwo.

"Who are you?" Mewtwo asked telepathically, his voice steady but curious.