Okay guys, I got at this point where I just had to tell someone.
I have bred for Shiny Eevees in my copy of Pokémon X and got four Eeveelutions now, but I never really encountered one until Monday when I found a Shiny Geodude in a Horde. It gave me kind of a hard time to be caught, but eventually I got it in a Dusk Ball.
On the next day, Tuesday, I found a Shiny Gurdurr in the same spot. I caught it with one Quick Ball.
On Wednesday, I found a Shiny Graveler. In exactly the same spot. I caught it in the first Quick Ball thrown.
Then today, on Thursday, I found a Shiny Murkrow in a Horde on Route 15 while EV training. I caught it eventually in a Repeat Ball.
Four days, on each an accidental Shiny. What is happening to me?! You won't hear me complaining, though...
Also, that means I have both a Shiny Graveler and a Shiny Geodude, so if you need one of those let me know. If you have a Shiny back it would be great!