Here you can download the Pokémon GO app for you Android devices. You can even remote install to you phone or tablet!
The app itself is free to install and play, there are OPTIONAL in-game purchases available.
To install the game you need a device with at least 2GB of RAM and running Android version 4.4 or higher. While GPS is not a hard requirement, it will make playing easier and smoother – there are no guarantees if you use a non-GPS device. Intel Atom processors are not supported at this time, thankfully that is a minority of current Android devices. Phones are preferred over tablets, as the app is optimized for the smaller screen. Data is needed, so if you don’t have Wi-Fi then a 4G connection is best. This information is based on game info as of July 5, 2016.