I'm sure it could be a reference to a few things. I instantly thought of the 90's kids TV show. Goooood times
Edit: So in doubles I regularly team up with a Sonic player. We usually just run around at the speed of sound and try not to kill each other and it works out pretty well - but I've been trying to think of things we could do to actually work together. I know we can throw into Back Slash, Sonic can tackle the quick guys Shulk hates, could probably pull some stuff like Sonic fthrow -> Shulk uair... is there anything useful that you guys can think of?