@NocturnLeader: Three shinies in a single day? Two of which were bred, and none involving the magic of the Pokéradar? I'm sorry, but until you provide some evidence supporting these claims, you are denied admission to the club.
Congratulations on the Rotom, DS! Did you find him last night or something or is your DS's clock messed? I never had a fair chance at getting him with only 149 resets done as of last night! :( Maybe I should go back to Chikorita, but I'm really getting the feeling that shiny SRing is nearly impossible, at least in an expeditious manner, on Emerald version, thanks to the RNG discussion at Smogon.
However, on that note, another possibility does spring to my mind which could allow me to find droves of like-Natured shinies on Emerald at an incredible pace. It's basically the same thing as my "correlated ID" hunt last year. Supposing that the sample population that you're going to see when you soft reset has a size of a couple hundred. Since different trainer IDs cause shinies to result from different PVs, there has to be a trainer ID which causes one (or more) of the RNG clones out of that popuplation of ~200 to result in a shiny. If I can get such an ID (by restarting my game completely), I should be able to get that particular RNG clone to recur for different targets with fair ease (as in 1:200 ease). The main problem would be that each shiny would have the very same PV (including Nature and gender value), making them looked quite hack-like despite not being. I'd also have to scrap my current save file which I've done a fair deal of stuff on. I don't think I'll do this, but it'd be a cool experiment.