Final Judgment

Unfortunately, the EXP you get is dependent on the difficulty level and the levels of the four characters that are participating in battle. You get more EXP on harder difficulties as the enemies are of higher levels, but the amount of EXP you get is dependent on your active battle party too. At lower levels compared to the monsters net you more EXP compared to the base EXP and at higher levels compared to the monsters, you get lesser EXP compared to the base EXP. At the same level as the monsters will give you the base EXP. SP is the one that doesn't change regardless of your level and how much you get is dependent on the difficulty. So it gets harder to level as your level goes up and you need more and more EXP to level too :X

Oh yay! Then you can finally bake them chibi Pokemon soon ^-^