Outside of Story Mode and Multiverse, a player can also visit the AI Battle Simulator to earn more XP in order to Level up characters. Unlike the other two modes of playing, you will do no fighting here. This mode is done by simulation, where the computer will play on both sides as you watch. All a player really has to do is create a three-character defending team or three-character attacking team, and then watch the results unfold.
If they choose to make a Defending Team, a player will only earn XP if another player challenges that given team with their own attacking team. If a player chooses to make an Attacking Team, they can search through and pick a defending team for theirs to go up against in battle. From there, the simulation will begin and the characters will earn XP once the battle concludes. A player can even speed up the simulation by a rate of x4 to quicker get through things.