No, the config is a .cfg, I think you are probably looking in the wrong place. All of the minecraft forge config files (like the pixelmon config) are in the "config" folder in your ".minecraft" folder, that's the same place as the "mods" folder where you put the pixelmon zip file. You will have to run the minecraft with Pixelmon installed at least once to generate the config file. If you REALLY can't find it (and you're using windows) try searching for "pixelmon.cfg" in the file browser (it shoud say 'search somewhere depending on what version you're using).
If you're using a mac, then turn in off, back slowly away, go buy a windows PC, install minecraft/forge/pixelmon on it and then do the above.
Just kidding, I have no idea how to search for a file on a mac.