Have no idea now. Wow, you did it on Platinum? HGSS is much easier to IV breed, indeed. Only one NPC.
Well, I don't know if they cracked the shiny part in B/W yet, but I hope, until the english release, we get RNG Reporter 9. :P
I always use a timer. Toast's ZomgTimer is a lot better than PikaTimer. Try it out!