In some cases you can get overlevel'd ,leveling is done with the Crysterium , you get points to level up your "jobs" at the end of battles and from getting fragments . As you level up you will need more points for each level so in a way this does make it a bit harder to be overlevel'd unless if you are trying to be and just grind for hours . I have never been OL'd for any part of the game but in some cases depending what and how you have been leveling your jobs you may get to a spot where grinding is needed.
...With revolution comes sacrifice.If you cannot understand that.Then you deserve to die with the others...- Yggdrasill 3DS FC - 1891 - 1572 - 7312
not really, no. The game gets more difficult as you progress, but each type of enemy has a specific set of stats and such, so as you increase your party's abilities and stats, the enemies will become easier for you to deal with.