So I also began using igameguardian and noticed something very interesting...
-At first you start the level you want to clear
-then you remember your HP and search for it in igameguardian
-change back to optc app and let yourself be damaged
-remember your new HP and search again for that number but without clearing the results
-change all of the results (should be 6 results) to whatever you like (I change all of them to 999999)
-change back to optc app and you'll see that you have 999999 HP and you don't have to worry about being defeated
NOW the interesting coincidence...
I don't know if it works for everybody but in my case, the change of the HP numbers to 999999 not only changes the HP, but also the attack of all PSY characters in my team to 999999, so I can also beat the opponents very quickly
this process of cheating works fine, but sometimes the fight doesn't continue and you have to restart the app (at least that's what happens on my phone) but I still hope that @akosij or @DiDA can update their great hack!!