Here is my FF6 no-experience patch. The recommended rom file is Final Fantasy III (U) (V1.1) [!]. As it is illegal to post rom files and I'm going to abide by that here, you're on your own to find the rom necessary.

The point of this patch is to allow for ease of low-level runs. No enemies award experience points and all characters have the same level average, rather than some characters being higher than others.

EnjoY!