14th July 2016. I was actually in the US for the launch there but as I had the wrong regional App Store I couldn't get it until I came home…it sucked when I got it, tbh, as I'm rural so could only play in my break at work - even with incense I was getting like 1 spawn every 5 minutes at home. Did a bit about a month at a time once per year at university, as I was in an urban area, then only picked it up again when I started my current job which involved a lot of travel…which is a mixed blessing as I've held some gyms since February!
Other than occasionally playing with a flat mate walking home, I haven't seen a single other player irl however. Even on Community Day.
Also I may create a new account today so I can - eventually, because you need to be a Lv.10 :( - make a trade and get one step closer to my Celebi!