PC supes is unstoppable, his only purpose of existance to exemplify PIS. While it's normally PIS isn't not allowed, superman's ability to make up powers is key to PC supe's apeal. therefore, while darkseid is having an energy beam war with galactus, superman shoots rainbow beams from his hands which turns tyrant into straw which via superweaving is turned into a clever decorative item which an accentuate any room in your house. Then of course superman shoots the big G in the back with anti-cosmic vison.
PC Supes always got his ass kicked by PC Darkseid right? And PC Darkseid is at Galactus' level, so the big G could do the same to Supes. And Tyrant is almost as powerful as Galactus, so he probably could aswell.
But the fact that it's PC Supes means he'll suddenly come up with some bizarre way to beat everyone.