Has anyone ever been the GOAT in two different weight classes?

Sugar Ray Robinson
Evander Holyfield, who I sometimes rank 3rd all time at heavy.

 

Maybe Armstrong at feather and welter.

 

Theirs a few that come to mind. I think H. Armstrong was tops in featherweight, lightweight and welterweight.
T.Hearns welterweight/ super welterweight some would argue he didn't do enough at welterweight.
Head to head though, he in my mind beats all but two welterweights.
Chavez Sr. Should be mentioned, super featherweight, through Jr. Welterweight.
Jones Jr. Had the talent to be included in the top 3 fighters from Jr. Middleweight, Middleweight, and super Middleweight, some would argue his competition was extremely suspect. I wouldn't argue against anyone who holds that point of view.
A.Arguello has a good argument from featherweight through lightweight.
Just a few fighters off the top of my head. There's a few that if they had stopped at certain division, like Duran he would certainly have been considered top 3 if he stopped at Jr.welter. or remained focused at welterweight.
Or R Leonard if not for the eye injury.

 

Men who you could make an argument for, especially while they were active:

Bob Fitzsimmons
Harry Greb
Henry Armstrong
Ray Robinson

More once the number of weight classes increase.

 

A case could be made that Fitzsimmons was top three all time in three weight classes, at various points during his career.

 

At first I read this as "Valuev." Upon rereading, your post is at once less amusing and more perceptive than it originally seemed.

 

He's holding down weight classes that haven't been made yet.

 

Man I don’t think anyone really acknowledges the ‘Bridgeweight’ division. Don’t know anyone init lol

 

Bridgeweight and superbridgeweight. A true triple crown champion, just like Armstrong.