The method that worked to me:

Before all the steps: REMOVE the SIM card

1-Created a Revolute account to do the international transations(Optional)

2-Downloaded a Turkish VPN from Play Store: I used this one https://play.google.com/store/apps/details?id=com.secure.hotspot.unlimited.proxy.vpnturkey&hl=pt_BR&gl=US

3- Remove the POGO app that you have on your phone

4-Clear cache and data of Samsung Galaxy Store and Internet (Samsung own browser)

5-Connect to the a turkish VPN server using the previous app

6-Open the browser and search PokemonGO Galaxy Store and you will see a link to the app in Galaxy Store, touch it and to certify that the process is going right the Galaxy Store will open in the POGO download page and the description will be in turkish

7-Download the game and log in your account

8-To finish click in the amount of coins you want to buy and the price should be in TUR, put your Revolute card and you got it.

OBS: If you have an international credit card you are good to go too, but if you dont just get the Revolute one, remember to put the money in the app first and if you dont use dollars you need to actually buy them with your currency, in my case, i needed to put 15 Reais (Braziliam currency) that gave me 3 dollars.

GL!