I'm currently 657:59 on Sapphire and have 2 shinies (plus a shiny Starmie spotted in battle tower). Time recorded does not include large chunks of time spent using rare candies to deduce hidden IVs and not saving (hint: nearly dead batteries are great for this as you don't need to worry about having enough power to save! SP owners can ignore this hint - dammit!)
I have to admit I've spent a large amount of time doing berries, contests and battle tower, which probably explains the lowish shiny count. I'm making an effort to raise L100 ones at the moment so I can finally assault L100 battle tower.
I like the idea of raising ALL species to L100. I'll probably be too involved with breeding programs to consider it for a looong time, though. I do like the idea of *having* one of each evo - the lower ones can be allocated as contest specialists if you *have* to have them as "useful".