FAQ:

>What country has this game been released in?
Officially: Japan, Australia and New Zealand

>It says that the app is incompatible with my devices! What gives?
This is a region lock and it is very probably that your device IS in fact compatible with Pokemon GO. Install the app to find out!

>If I live outside of Australia, can I download this game for Android?
Sure! Keep reading for directions.

>How do I download the game?
Go to http://www.apkmirror.com/apk/niantic-inc/pokemon-go/pokemon-go-0-29-0-release/pokemon-go-0-29-0-android-apk-download/
You will need a file manager on your phone. Get a file manager in the Google Play store.