You have been a Pokémon trainer for quite some time. You stumble across a cave and decide to look for a Zubat. You find yourself pretty fair into the cave and spot a Mewtwo. She makes eye contact with you

“Oh, A human? How did you get this deep into the cave without fighting all the Pokémon?”

She looks at you with an intimidating expression

“Well… my name is Celeste.”

Celeste seems unhappy that you have found her.