As the game grows popular, many hacks have been started to circulate for accessing unlimited pokeballs and poke coins. Though all of them are not authentic, some of the hacks user comments are extremely positive. Hence it is worth a try.
Steps incorporated by most of the hacks:
1. Access the source for unlimited poke coins and enter your Pokémon go login.
2. Select your operating system.
3. Choose number of coins you require.
4. Install an app from a list of apps provided and run them for 30 seconds.
5. After this you can uninstall the app and then your account will be credited with the desired amount of Poke coins.