It keeps the ROM and any associated "seed" files (which allow others to play the exact same random layout) together.
. It transforms a predictable playthrough into a completely unpredictable challenge. How to Get the "Randomizer" Experience Pokemon Emerald Randomizer Rom Download Zip
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Imagine a Blaziken that is Water/Electric type or a Pikachu that learns Hyper Beam at level 5. It keeps the ROM and any associated "seed"