I was wondering if I create a game center leader boards if I could reset all the game scores posted on it? Not remove data during test but after launch.
The reason for me asking this is I was thinking about creating a game where whoever has the highest score by the end of the week gets a bonus of some sort based on my game and then a new competition starts and all the data resets again so new scores can be uploaded.
That's not what they were designed for, no. While it may technically be possible using score deletion through the iTunes Connect interface, I would recommend against it and try to come up with either your own solution or a different third-party service.