OK, so I ended up deciding to get White today, so I could now do a 5th gen shiny. I'll have to learn how to work the RNG eventually anyway. If it's a shiny Victini you're after, what nature would you want? I'm gonna start breeding Synchronizers so it'd be good to know. It could take a while though, because I don't know what kind of time I'll have this week and next week I am gonna be on spring break, so no time for RNG abuse.
I currently don't have a fifth gen game and the RNG manipulation looks like it would take me a while to get the hang of, so I think something else would work better. Sorry to disappoint... if I end up figuring it out at a later date, I'll try to remember to let you know.
I can do shiny. I've got a Timid (I think...) Articuno which is shiny and has all stats 25+, and I haven't yet captured either Lati, Raikou, Entei, Mewtwo, Groudon, or Ho-oh in SoulSilver. Do any of those interest you? (I can probably get better stats now that I know what I'm doing. And the roamers will take more time.)