Most: Hank Armstrong. Held world titles in three different weight divisions simultaneously, all three titles were undisputed championships.
least: Pacquiao -eight division titles
Hank didn't need no darn tootin catchweight fights. His record = mas macho!
Pac's record IMO doesn't register as legendary to me because had he fought in 1930s 1940s, 50s, 60s, he'd have to go from smallest to heavyweight to do that!
Flip the script, had Hank Armstrong fought in his era, whose to say he would have won 9 or 10?
I love Pac as an action fighter, great power, speed, will, but that record IMO is kinda bogus, especially considering that he never held 2 belts in any division, let alone clean it out.