Pacquiao has to be among the best modern picks here. Murray Sutherland yo yo'ed all over the place between middleweight, super middle and light heavy. Anthony Mundine also dropped down, I believe, from 168 to 160 to 154, winning meaningless titles each time out as well as I'm remembering properly. Everett "Bigfoot" Martin bounced around from being a 168/175 pound prospect to eventually a very fat 260 pound heavyweight. James Toney starting fighting not too long after Martin and followed in kind. Who you got?
Used to chew on the meat, swallow the juices and then spit the chewed up meat up, correct? Claimed it was his secret to weight loss or some such.....
In 1965 Buster Mathis weighed in for his pro debut at an even 300 lbs! In 1968 he was down to a slim 220½... only to balloon back up to 280 lbs 4 years later.
Orlin Norris. What do you make of 5’9” Orlin Norris? When he wanted to be a heavyweight Norris was in line with Tua. He turned pro at 199lb aged 20. Grew to 227lb contender (who beat Greg Page, Renaldo snipes and Tony Tucker) all within four years as an exclusive heavyweight then aged 25 Norris dropped to 189 on a whim to become a cruiserweight. From that point Norris was a 187-190 cruiser for as long as it suited him but in 1992 aged 27 he fought David Sewell at 190 then under three months later did some Charles atlas programe and weighed 20lb more knocking out Troy Jefferson whilst weighing 211. Two months later Orlin was 190 again! After four years of being mostly a cruiserweight Norris again leaped from 188 to 220 to campaign as a 220-246 heavyweight. After another few years of that Orlin incredibly dropped down to cruiser in his late 30s. Amazingly Norris was 196lb for his very last fight aged 40. That’s four pounds lighter than his debut 20 years earlier. Astonishing for a 5’9” guy who was as high as 246lb.
"Aboriginal" diet per the Ol' Mongoose. (Promoted now on late night home TV commercials.."call in the next 5 minutes...etc")
Manuel Ortiz's weight was all over the place in between bantamweight title fights. He boxed as high as lightweight at times and still got back down to 118.