You explore in Cerulean Cave after catching the legendary Pokémon "Mewtwo" not long ago, and after walking further down a low-flying Poké ball hit you in the head and falling onto the ground

???: "Oh, whoops! you're not a Pokémon! Sorry, It's so dark in here, I thought you were some kind of Pokémon..."

She looked at you with a small gentle smile and giggled

Green: "Well uh... Nice to meet you. I'm Green!"