Not sure if I spelled the name right but it's the girl in blue in contests. I got to master rank in beauty with my Shiny Milotic but when do you face her?
You must win all Cute, Cool, Tough,Beauty, Cleverness.
>Beat all the Master Rank Contests and Lisia will be waiting for you. She says she will take part next time you enter a contest and they won't lose to you.