Geezus Marb, you aren't asking for much of a reply are you.( admit it, you're a glutton for punishment aren't you dude)
All-time is way to subjective there's hundreds of all-timers, may I suggest best ever in each division? For example: Joe Louis @ HW, Roberto Duran at Lightweight, Ray Robinson at Welterweight, et al.
As for a sensible criteria to use to create a list of the greatest boxers of all time. I'd say, the number of titles and defenses, longevity, dominance over contemporaries, how they represent the sport, and how they capture the imagination of the wider public would be a good start.
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