hmm interesting...they have both demonstrated they can create matter...I havent seen Frankin Richards do it so engaging...he created tat universe subconsciously, which is kinda impressive...Molecule man has created and ignited thousands of Stars while physically travelling through space faster than cosmic beings travel by warp means...they are both the most powerful mutants ever...Molecule ma went on to merge with the beonder and become a cosmic cube
First of all the Molecule man is not a mutant, his powers comes from the cosmic cube. Before he merged with Beyonder to become a cosmic cube he hide some powers in Volcano which he later took back and became really powerful. He actually defeated Beyonder and Kubik also backed away from him. He is the most powerful of all cube beings because of his human mind besides he don't really need a physical body to live like Franklin!
Well, if your talking about MM before the recton, he takes it every time. Post recton MM is still pretty badass, but Franklin is supposed to be on par with(or at least have the potential) the Celestials. Now when the evolved Beyonder and Kublik were exploring, Kublik acted like the Celestials were WAY beyond either of them in power. So this could actually be a good fight.