Ryu777
Smash Ace
I think the way that makes the most sense for a character to recieve the special is not simply by it dropping to the ground like a normal item, but by doing something difficult to do that earns you the special. For instance; dealing a 50% or more combo, reading your opponent and not being hit for a long time while still hitting them, getting the crowd to cheer for you. It would make the most snese if there were an invisible meter that the player could not see, but would build up by doing difficult tasks such as the ones listed above. It could also e used to balance the match, so if someone just got three stocked, they would get a super to try and catch up.