So I was thinking of an idea for Shulk's moves recently, inspired by Squigly from Skullgirls.
Basically, the idea is for all four of his specials to be chargeable, and for the charge to carry over to one another. So if you charge any of his specials, you charge the other three as well (and you can store the charge like with most of such moves in Smash). But using any of the four moves uses up all of the charge that you've built up for the other three as well.
I feel like it makes sense on a number of levels. The Monado feels like a "charge weapon" in some ways, and the mechanic would also represent the Talent Gauge to an extent. Furthermore, charge moves in the standard Smash Bros free-for-all are generally most useful when the other players aren't paying attention to you, in other words, when you don't have any "aggro." You see what I'm getting at, right?
I think it's a fun idea, at least.