My idea for a Smash moveset for SpongeBob.
Neutral special: Bubble blowing. Press B to blow the bubble and it will get bigger and bigger and press B again to blow it at opponents. If you wait too long to press B a 2nd time, the bubble will pop.
Side special: SpongeBob throws a yellow bowling ball at opponents.
Up special: The Bubble viking helmet attack.
Down special: SpongeBob summons his Krusty Krab grill, then his down special becomes dropping frozen patties, after you put a frozen patty on the grill, then his down special becomes using his spatula to flip things, once you flip the patty, then his down special becomes putting the patty in a bun with toppings, thus making a Krabby Patty. Once you do that, then press A to take a bite of it. It takes 5 bites to eat all of it and opponents can steal it from you and take bites of it and the longer it's cooked, the more each bite will replenish, but if the the patty gets burnt while it's being cooked, the bites won't heal at all.
Final Smash: SpongeBob dresses up as the Goofy Goober wizard and uses his guitar to blast lasers.