so I was playing xy and I entered the fighting dojo to the 2nd floor. the screen flashed black a few times and a hex maniac with no walking animation appeared. she said "no. your not the one." and left. what is this?
You encountered the Lumiose City Ghost Girl. As yet, no one has identified her purpose for being in the game (if she even has one). There is, however, a wealth of theory to be found on the subject. Some of it is quite interesting.