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In my opinion, Ness ought to fight this Boss character instead.
Ness' Classic Mode route in Super Smash Bros. Ultimate is called "Home to Onett!". According to the Super Smash Bros. wiki, "Ness fights opponents largely based on his journey in EarthBound in reverse from Magicant to Onett.." ...That is, all but the Final Round with Master Hand.
I don't consider Master Hand & Crazy Hand to be the suitable boss characters for this Classic Mode, even though they might fit the theme. Ness has fought many weird and abstract enemies in Earthbound after all; maybe if the Hands were fought at the Onett ? form instead, to better fit the "alien invasion" concept for that series. However, I feel that Marx could've been an even better choice, fitting the Earthbound criteria of being a wacky nut job alien-like being that's fought in unknown region of outer space and uses moves that would be better fitting for that series in comparison to the Hands.
If there were ever to be an update for SSBU that would change the Boss character for Classic Modes, Ness ought to fight this guy instead.