Niantic has teased that Pokemon GO players will soon have the chance to get yet another Master Ball. Like in all other Pokemon games, Master Balls are the best Poke Balls in Pokemon GO. Pokemon GO players can guarantee a catch whenever they use a Master Ball, but the downside is that Master Balls are in short supply. In fact, Pokemon GO players have only ever had the chance to add two Master Balls to their item bag since they were introduced to the game.