LogFAQs > #966379614

https://gamefaqs.gamespot.com/poll/8343-which-of-the-original-super-smash-bros-characters-is-your

https://gamefaqs.gamespot.com/poll/7435-which-of-the-original-super-smash-bros-characters-is-your

^ last place in a twelve-way poll both times. Bad look, but it's an all-Nintendo poll with Link and Pikachu...hard to gauge much beyond last place sucks and she doesn't have many hardcore SSB-fans.

https://gamefaqs.gamespot.com/poll/3691-cb8-vote-in-day-1-which-character-would-you-most-like-to-see

^ last place in another twelve-way poll. This is a poll with Missingno getting first place (nearly quadrupling Jigglypuff), Mudkip getting sixth place (more than doubling Jigglypuff), Toad getting seventh place (more than doubling Jigglypuff), and Yoshimitsu getting eleventh place in a poll with four characters known through fighting games. Still some LFF and SFF excuses available, but eeeeehhh not looking good.

https://gamefaqs.gamespot.com/poll/5151-character-battle-ix-division-1-round-1-x-vs-welkin-vs

^ not that Mega Man X can't SFF some Nintendo characters or pull some anti-Pokemon magic (thinking of Mega Man-with-Zero ousting Charizard), but Jigglypuff is a Pokemon and a unique one at that so I'm cautious to assume much SFF. She's probably just weak. She's clearly not high on the Nintendo, Pokemon, and fighting game totem poles anyway.