I know someone who bred about 150 Ralts' to get a shiny Gallade. Finally got it, Jolly, we go to check IVs and everythings 31 except sp atk.
Wasn't too pleased with his luck there.
If it makes you feel any better, one time i got a shiny palkia off the GTS. so I tried to clone it. I offered it for a lvl100 female wurmple.
Because my wifi is sometimes homosexual, it said that there was a communication error. after 5 or 6 tries, i got back in, only to find that my brand new shiny palkia had been traded for a lvl100 wurmple.
I was extremely pissed off the next day.
The only shinies I ever seen was a Shiny Tangela in Gold