The phrase in question refers to an application package file, typically associated with the Android operating system, that contains the installation files for the Pokmon Go game, but specifically mentioning iOS, Apple’s operating system for iPhones and iPads. An APK file is used to distribute and install software on Android devices. The combination with “iOS” suggests a modified or unofficial version potentially aimed at circumventing the official Apple App Store.
The inferred need for this arises from the fact that applications for iOS are normally distributed through the Apple App Store. Bypassing this mechanism to install software carries risks, including potential exposure to malware and violation of the application’s terms of service. Historically, modifications have been attempted to provide modified gameplay or access the game on devices where it is not officially supported.