Poke balls in Pokemon GO are vital tools that trainers will need to build up their team. They act as both capture devices and homes that hold caught Pokemon. There are currently 5 different types in the game, however, only 3 are usable in most situations.
To use a poke ball for catching new allies in Pokemon GO, trainers will need to fling them at pocket monsters that appear on their screen in encounters of various kinds. One's aim will affect a poke ball's catch rate, however, they still have their innate individual catch rate stats.
Poke Ball
In-Game Description Of A Poke Ball
"A device for capturing wild Pokemon. It's thrown like a ball at a Pokemon, comfortably encapsulating its target."
About The Poke Ball
The regular red and white Poke Ball is the most basic in the game. Initially, players are given 50 of these when they begin the game on a new account, and, additionally, Poke Balls are rewarded by leveling up until the trainer reaches level 11.
Great Ball
In-Game Description Of A Great Ball
"A good, high-performance Poke Ball that provides a higher catch rate than a standard Poke Ball."
About The Great Ball
Notable for its blue top-half with the red tabs, this is the next step-up from the regular Poke Balls. Great Balls increase the player's potential to capture a wild Pokemon by 50%. After a trainer reaches level 12, they will receive 20 Great Balls as a gift. Furthermore, they will unlock the ability to get them from spinning Photo Discs and by other means. Players also receive Great Balls upon each level up to until they reach level 19.
Ultra Ball
In-Game Description Of An Ultra Ball
"An ultra-high performance Poke Ball that provides a higher Pokemon catch rate than a Great Ball."
About The Ultra Ball
The optimal device for catching Pokemon, the yellow and black Ultra Ball increases the trainer's chance of gaining a new Pokemon by 100%--almost guaranteeing the capture. Upon reaching level 20, players will be gifted 20 Ultra Balls for simply playing the game. They are also unlocked as a reward for spinning Photo Discs and more. Trainers receive them as level-up bonuses until they reach level 40.
Master Ball
In-Game Description Of The Master Ball
"The best Poke Ball with the ultimate level of performance. With it, you will catch any wild Pokemon without fail."
About The Master Ball
So far, it is not possible to acquire the Master Ball in Pokemon GO. This purple and pink poke ball is in the game's data but has not been implemented yet. However, known from its appearance in the main series of Pokemon games, the Master Ball will undoubtedly be the perfect device for catching Pokemon. Though also like in the main series games, there will probably only be one available to every player.
Premier Ball
The Premier Ball stands out as the only kind of poke ball without an in-game description that gives the player some lore beyond what is known about it in the main series games. It is only used in Raid Challenges to catch Raid Bosses but is only unlocked after level 5.
Premier Balls have the same catch rate as regular Poke Balls, though, they cannot be stored in a trainers bag and disappear after a Raid Challenge. Players will get Premier Balls in a Raid Challenge depending on their performance, with trainers that contribute more receiving more.
Pokemon GO is available on Android and iOS.