I'm not intrested in HG/SS for now, only when they're released in English. And maybe only sometime after that. I'm not a Pokemaniac, I haven't even started PT yet (Though I do have some phases of myself... And I AM on a Pokemon phase... Just finished Rumble, started Mystery Dungeon Blue, as I had never played a Pokemon MD game, and after that I'll start Platinum... IF my current pokephase doesn't end before that )
Anyway, I don't think you know how easy the proccess I have in mind is.
Load PokeSav
Load D/P save
Export pkmn
Load Pt save
Import pkmn
Save
In fact, I think it's faster than going through Ranch
I won't even need to change every pkmn's ownership, as I'd already have changed my Pt save to essentially be the same character as my D/P ones.
I'll check out your app, it may be even easier than using PokeSav.