The Pokemon games always come in paired releases where you can either buy one or the other cartridge. This forced players to find each other in order to trade Pokemon and obtain an entire Pokedex. Trading and multiplayer gameplay have been a hallmark of the franchise since the beginning is present in every main series game. Over time the feature has evolved and the Pokedex has expanded. Currently, players can store their Pokemon in a cloud-based app for Nintendo Switch, a successor to the previous Pokemon Bank a paid service for storing Pokemon on the 3DS. This allows players to trade and interact with each other to obtain a large number of Pokemon.