For Jailbroken Devices of iOS
1. Download Xmodgames from apt.xmodgames.com & install XMG.
Check more in www.xmodgames.com
2.Tap on the banner or Toolbox.
3.Select Pokemon Go's Entry.
4.Download the game first. It's about 70M. Be patient and make sure that you're on wifi.
5.Install it via AppCake.
6.Play it on XMG. Have fun! It's no more restricted now. You can see pokemons everywhere in restricted regions.
If you couldn't be redirected to Cydia, please jailbreak first.