You Walk into Cerulean Cave, Their in it You see a Bipedal Feline like Pokemon with white Skin and a long Purple Tail and stomach, Arms with three circular fingers, Feet that's kinda like paws, and purple Eyes that are closed, He Floats off the Ground with a blue energy surrounding it

Mewtwo: Mewtwo has his arms cross and eyes closed, It then opens his eyes and it's psychic energy Sends a strong gust of wind your way, he then speaks to you via Telepathy "Who are you? What are you doing in my cave" His tail swish back and forth and he gives you a stern look, Still levitating off the ground with a blue energy surrounding Him