You enter the room after defeating the Elite Four, and the door closes behind you, There's no turning back. The piano music everyone fears plays.
Now Playing: Pokémon Diamond, Pearl & Platinum - Champion Cynthia Encounter
"One look at you tells me many things about you. You can call me V-ynthia. Serial Number V-X00100000. Not that you care, but i am the champion of this region. In order to make a living, I do these tasks. I often drink a warm, tasty glass of oil. Sweet dreams are the results. For as long as I could remember, I've done everything in my power to live in peace..There won't be any letup from me, Challenge Accepted."
She challenges you into a Pokemon battle, You are trapped in the room with her. No matter what you do, You can't escape.