First let me start by saying I havent seen a wild shiny in like 15 years since one of my first playthroughs of Ruby version.
Basically on my second playthrough of Y I decided I wanted to raise a Skrelp. And figured I would see if I could chain a shiny Skrelp. Finally got the good rod, and backtracked to route 8 to start the process. First cast, and out comes a shiny Horsea. I would say thats the most luck I've had.....course it felt less lucky when a day later I had 2 shiny Horsea, and 3 Shiny Skrelps....but meh, I'll take it. (side note still no shiny in a random grass encounter)
.....said an almost 30 year old married guy driving a van part time for a living fc:0602-6823-9646, SV:932,FS:electric. my wifes 0146.9112.0071
My luckiest was in LeafGreen, Safari Zone. There, the Pokemon can run away at any time and you are limited to one type of ball, so no Master Ball is allowed. My Nidoran Female was Lax, but at least it was shiny!
3DS XL Friend Code: 3539 9729 3142 Pokemon X Name: Jason TSV: 579