Say Sableye is on a team with 2 out of the 3 other players? And there is just one player that has to take Sableye down all by himself?
True, I didn't think of that. Maybe the stamina of the crystal would increase for each extra player?
More stamina for each opposing player, then.
Eh, I like the idea of foes trying to smash open the crystal, makes it more interesting.
meh moveset is meh
I like the idea behind the Final Smash though, most certainly. Whenever someone gets their FS, it's always either run like a bitch 'till it ends or be ready t' dodge it at any moment. This FS makes ya actually fight while it's goin' on.