[February 5, 2015 update!]
My Save Dongle arrived in the mail today. I plugged it in, upgraded the firmware and then it was ready to use. I loaded up my Platinum cartridge and exported the files from the cart to my PC as a .SAV which I then opened in PokéGen.
Unfortunately, it seems the entire game is corrupted.
No Pokémon can be detected in the PC or in my party. Even PokéGen is confused when I load up the .SAV - it prompts me to clarify what game it should think it's loading. To make sure this was not a hardware fault I ran a test. The transfer worked fine for my Heart Gold game though and everything can be viewed perfectly well in PokéGen. It seems I'll just have to reset. Any further suggestions/refutation are welcome. I'm going to look around just a little longer for a solution.
Once again, thanks for all the help!