Pokemon GO is an augmented reality games made by of Niantic's, a google startup company, available in Android and iOS devices. Pokemon GO begun to release worldwide since 6 July 2016 but available only in several country. They will release it in staging base. Currently, only available in US, Australia and New Zealand.
So how can other country to want to play Pokemon GO now? It will not listed in your Play Store or App Store.
Don't worry you still can play it, because of that you are in the right place here.
Alternate way to download and install
First you have to go to APKPure.com or you can click download the link above (i hosted the APK file). After you download click install.But before that, make sure you have the following option to be done.
On your phone go to Settings, Security and enable the installation of apps from unknown sources. And then you will enable to install apk from any source beside from play store.