Just to tell you Ion is way above Franklin Richards he would beat him any time of the day 10/10 Ion's power level is multiversal just like Parallax and Parallax could easily wipe out all the celestials since Ion is stronger than he could also do that
Well Lets see Franklin was able to make his own Universe w/ the abstract the likes of Galactus, Watcher and so on.. And if he is able to make a Universe wouldnt that make him a multiversal in power.. And a Celestial was also capable of supporting a Universe (even dough she gave up her freedom in order for that Universe to Strive inside her), also on that same issue they were capable of destroying a Universes, would'nt that make them capable of multiversal feat? Being able to destroy Universes.. So bearing that in mind there is a Universe that is full of Celestials each possessing those kind of power.. Classic Ion is very Powerfull but against all those Celestial, I dont know..