So from your list the actual most powerful there is pre-retcon Molecule Man, he is actually rated as the third most powerful character ever in Marvel behind TOAA and pre-retcon Beyonder, he is even above The Living Tribunal.
Mad Jim Jaspers actually had more potential than Franklin Richards but they really didn't push his character deep enough. But he is at one point an Omniversal threat which rings The LT's doorbell, Richards has no such claim to that level.
Franklin Richards is also Omega level.
Ignoring Emma Frost, the Phoenix Force is an outside presence as old as the universe itself and is kinda inconsistent with how they use it tbh.
Don't worry about the others, they don't belong here.
The answer here is Molecule Man providing he is pre-retcon version, he is actually so powerful they had to nerf him otherwise he owned the comics, he is equal to The Beyonder who is equal to TOAA so in essence Molecule man = The One Above All AKA God