VIDEO : When Can You get Masterballs in Pokemon Go?

Pokemon Go has officially become the most downloaded mobile app in US history. By the time you reach Level 20 in Pokemon Go, you can get access to Ultra Balls to capture Pokemon. However many are speculating whether or not there are master balls in the game. The pokeball guaranteed to capture a pokemon. A recent data mine of Pokemon Go's coding revealed a ton of data, included a picture of the Master Ball.