So I'm writing this up just because I can, lol also in case I'm not the last person to actually figure this out, and for future player benefit.
While I was bored today, I decided to mess around with the dragon ball mechanic to see how to pick what wish. As it turns out, not complex. 4 wishes, 4 directions on the pad.
Up: active character heal.
Right: Ultimate power, aka second sparking blast.
Down: Blue health heal for entire team.
Left: Revive.
The selection does not change if you press multiple times, so feel free to just mash the button once the animation starts, press X as soon as you hear the selection sound of whichever wish you want.
Probably not a thing that gets used often in real matches, but hey, now it's here.
"You know nothing of death... allow me to teach you!" Dreadlich Tamsin
Download the latest version of my Bokura no Daibouken 3 guide
here.