You need a way of identifying what "player level" this enemy is intended for (and you need to define how "player level" is to be calculated - is it the leader's level, a certain actor's level, the average level of the entire party, the average level of just the battlers)
You also need a way of saying how much EXP to give if the "player level" is below that figure, and how much to give if it's greater than that figure (and how much if it's exactly that figure)
Party Leader since I am doing 1 main character and temporary other party members
It's likely that these things can be set up using note tags. But you will need a plugin to do the calculations and comparisons, and to give the appropriate EXP based on the results.
It could be set so you could do something like this in note tags:
<playerlevel: 5><EXPifLower: 10><EXPifHigher: 0>or something like this:
where the first number is the player level, the second is how much to give if below, and the third how much to give if higher.Of course there could be other possibilities too.
It would be a case of you working with a scripter to determine what's the best method that makes it both easy to code and easy to use.
Edit: @Liquidize, given GraveBusta's apparent confusion when it comes to scripts, I think the one you provided might be quite a bit too difficult to implement.