If GameGem doesn't work try GamePlayer if that doesn't work try iGameGuardian
You should be able to find GameGem from the BigBoss repo., and GamePlayer from the repo http://repo.xarold.com/
None of these have the advanced functionality of GameGuardian for Android, but they will get the job done as long as you are searching for a value that changes, if you are try to do group searches the only thing thing for iOS that will even come close is iGameGuardian, and you have to use the Nearby function and set the offset range down to 256 to kind of simulate the stock GameGaurdian 512 offset group, and then search the values that you would put in your group 1 at a time.