EnGarde
Not Dead Yet
I know what you mean here. I've got like 3 shiny hoppip, a psyduck, plus a handful of others from horde training this gen.I've had a few others, mostly Pidgey and the like that I've run into while EV training. I can't remember most of those, they aren't quite as special as the random shinies as you're killing literally thousands of their brethren so they're bound to show up eventually.
Mew King consider yourself lucky if all it took was 300 and 450 eggs to get some shinies. My current shiny chance is well over 2,000 (that means, I got 1 shiny after hatching about 1,000 eggs, and since then, I've hatched over 1,000 more with no shiny). I'm using a foreign ditto paired with a pokemon bred on my game for the Masuda Method, plus I have the shiny charm, but I'm just getting really bad luck here. :(
Eventually I'll get another one, though, since I still breed semi-regularly.