EDIT: There seems to be a lot of confusion in m question so let me pose this again.
My brother and I have separate APPLE ID's. I recently made a new Apple ID so I can download Pokemon GO and all was well, I signed out of the new Apple ID and went back to my own Apple ID and it worked perfectly (note: Pokemon GO has a different G-MAIL for everyone). The next day, my brother went onto the Apple ID that I created new yesterday and downloaded the APP as well and then logged back on to his account. At the moment we are both playing Pokemon GO, there will be an update next week; can we both log onto the APPLE ID that I made and update the app? Or can the update only work on one phone?
Original: I have a concern, I recently made a new gmail account in order to make a apple ID in a new country so I can download Pokemon GO - recently my brother found out the details and he signed into the account I made on his phone and downloaded the application as well. When the time calls for an update for the app, are we both allowed to update the application on our different phones or will it cause problems?
Thank you very much