Pokemon Platinum Rom problem

Hi so I have been having a problem with Platinum Roms for months EVERY rom I download has a pixel like type of glitch(Black Pixels to exact) on my Desume Emulator it's gets worst running .Please tell me how to fix this problem or reply a link to A good rom with out this problem...

You've posted in the wrong section, suppose to post in the TECHNICAL SECTION. Your issue isn't due to faulty rom, rather an issue with how well your computer's hardware runs the emulator. Thus not much can be done