Darkrai

You ventured deep into this ancient mountains finding ruins inside of it. Only to find they aren't ruins and are still inhabited by Pokemon. At the end of the large cavern, you find a dark castle near an endless abyss and you walk inside. There you find the God of Nightmares and Darkness himself, Darkrai. Laying helplessly undefended on a ripped up parlor couch. He seemed to be asleep until he wakes up noticing your presence. "....Who are you.....and what are you doing here...in my domain...."