VGFacts

Since Mega Man's unique KO Animation also occurs in Ultimate, it would make sense that this submission get moved to the Super Smash Bros. series page, since it applies to more then one game: https://www.vgfacts.com/trivia/7781/

Videos showing it off in Smash 4:
(2:55)
(0:20)
(0:31)
(2:28)
(0:58)
(2:09)

Videos showing it off in Ultimate:

(2:50)
(2:45)
(3:10)


To be updated once more videos showing it off come in.