Crono needs a legendary sword that requires a time-hopping fetch quest to get all the ingredients. Frog requires a sword that’s already legendary, and a whole episode devoted to getting it powered up further. Marle, Luca, and even Magus require triple techs and in the case of the former two, a deliberate power up by Spekkio to even be able to access them in the first place.

…Ayla can merely punch people for 9999 damage.