Let's see.
Mario & Luigi get infnite freballs, which wouldbe natural if they were fiery. Dr. Mario gets infinite megavitamins, but he also does in Dr. Mario... Link & Young link get infinite bombs & arrows, and if they lose their boomerang they always have a backup. Sheik never runs out of needles. Yoshi never runs out of eggs, as we've established. Peach pulls out infinite veggies without grass being visible before pulling. The pokemon never run out of PP. Mr. G&W never runs out of sausages (oh wait, he doesn't in chef ether.), Fox & Falco's guns never run out of ammo*, Kirby never runs out of final cutters, but the blue thingy you see fly off is probably a sonic wave. Samus doesn't run out of missiles or beams, or those little v+B bombs*. Ness doesn't run out of his powers*, and I think that's about it. My conclusion: SSBM is awesome.
*if they don't run out even in the main games, that's my bad.