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Unfortunately, your advice for him doesn't work for me...when I open the Config file, it doesn't open as "B:"Allow vanilla mobs"=false", it opens up as a bunch of symbols, "Allow Vanilla Mobs", couple more symbols, and "N"...and before you ask: yes, I HAVE tried changing the N to a Y...and multiple other letters...and even the word "True"...
It apparently needs some reader program or something, but I don't know what I need...
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.