You, and three other trainers that have been summoned to this castle-like place by an unknown thing, are walking around, looking at things on the wall, some fountains in the big room, you let out some of your pokemon to see as well.

All seemed calm, until they heard something... behind them and or all around them. It didn't have a specific location yet.

"So... you're all here..." A voice said ominously.

The trainers look around for the voice, they can't seem to track it, as it spoke again.

"You're all probably wondering who I am... and why you're here..." It spoke again. It sounded like telepathy.

It then came out from behind the wall from the front of the room, it was a pokemon nobody has ever seen before...Mewtwo.

"Why hello there, lucky ones... you have met the most strongest pokemon trainer and pokemon me. I, am Mewtwo... created by a lab of..." Mewtwo trailed off, seeming to scoff to itself.

"Imbeciles." Mewtwo's mouth never moved while it spoke, it was the telepathy doing that.

"Now, I didn't summon you four for my life story. This is for something...more important." Mewtwo said, its voice getting low and shady as doing so, looking straight at you now.