Through random encounters while grinding, I have found 22 Shinies so far since SM released! I have never gotten close to that in any other Pokemon game I've played, which is all of them. Luckiest Shiny streak I've ever had.
I've tried it a few times, but have had no luck. Right now, I'm trying to get a bunch of my Pokemon to level 100 via grinding. And, with the lowered Shiny encounter rate and a ton of luck, I find Shinies fairly often. Whenever I catch a duplicate, I want to trade it for something I don't already have and really want.