Game+guardian+ipa+file+install |top| -

GameGem was once a memory editor for iOS 9-10. It is no longer maintained but may work on extremely old devices.

Attempting to install Game Guardian via IPA files carries substantial risks that go beyond typical software installation: game+guardian+ipa+file+install

Sideload with AltStore / AltServer

A separate tool inspired by the Android version but developed specifically for iOS. It is usually available through Cydia or Sileo repositories on jailbroken devices. GameGem was once a memory editor for iOS 9-10