Pokemon Go players frustrated with difficulty of catching newer species

Pokemon Go players believe that newer Pokemon introduced in the game are more difficult to catch, requiring more Poke Balls and Berries. Some players express frustration with the catch rates of certain Pokemon, feeling that they are too low for inconsequential creatures. While there are ways to guarantee catches, such as using a Master Ball or getting a Critical Catch, it is unclear if the perceived difficulty is a trick of the mind or a deliberate game mechanic to encourage in-game purchases.