Answer:
First you gotta know what Dystopian is; A fictional city, then you start.
It could take place in the end of the world were the girls are equal to men in strength, and are treated fairly.
Or you could make a plot about those girls are the last alive who need to survive in the "New world" Zombies come rushing in from every dimension, or Purses attack (sorry |dk to well)
It could be about a group of girls who become the leaders of the city and enforce equality too.
All of this came from a male, me.