the big problem with Final Smashes(aside mostly being hideously OP or terrible) are they are not a consistently available option(and actually remove some to activate) nor do they use a resource to use for the consistency, and some outright change into a different character completely(Hi Samus).
there's also the moronic way of getting them, which is up to chance most the time.
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Oh SuperNiceDog's doing it again dude.
SuperNiceDog, you ain't no pimp dude