Well, it's not really that hard, but if you are wrong, because you had to save because you wanted to check your SID, you have to delete your saved file first before you can try again. So, on DS, it'll take long, but it's do-able. :) I did it on my original Platinum as well.
But if you don't really care about legends, then you should start your SS game, finish it, and get yourself a flawless Ditto, find your SID, get some parents and fly to Goldenrod, then head south to the Day Care. Once there, I'll teach you to RNG abuse shiny perfect eggs.