Is FFX the first and only FF game where another party member participates during a supermove (overdrive)?
By manipulating the affection. You can even determine whether it is Lulu, Yuna, or Rikku that shows up and throws the blitzball to Tidus for Blitz Ace. That has to be a first and only.
I know there was affection in FFVII. But, that was related to the date at the Golden Saucer not any limit break.