The DX edition improves upon the original hack by incorporating mechanics found in later generations:
Moves now use Attack or Special Attack based on their individual nature rather than their type. Pokemon Fire Red Omega Dx Download UPD
All 386 Pokemon from Gen III are available to catch, with new wild areas and revised trainer battles for a smoother level curve. The DX edition improves upon the original hack
To play the latest version, you generally need to patch a clean with an IPS or UPS file. Difference between Fire Red Omega and DX Pokemon Fire Red Omega Dx Download UPD