On the second floor of the building to the right of the Galette stand in Luminose City, immediately after entering the floor, the lights will flicker on and off and a Hex Maniac will appear behind the player, who will then float (as she seems to lack any kind of walk animation) off screen and say, "No, you're not the one..." before disappearing.

In the first room on the right on the fourth floor of the Hotel Richissime, she will be there as well. When talking to her, she will say, "Don't talk to me... if you do, I can't hear the elevator..."

There has yet to be any explanation as to who this character is.