just push either the x, square, triangel or circle button, the closer you are to maximum when you push button, the higher your meter will be, and you have a better chance of winning the struggle ( unless the opponent gets it higher than you).
full explanation; enter hyper mode (PKGE or R2) and launch your hyper move (PKGE or R2 while in hyper mode). A little cutscene starts, somewhere during the cutscene a little bar appears at the bottom of the screen, on the left side you see "P1" (in multiplayer or tournament it can also be on the right) and next to it is a little bar that fills up, above that bar is a bigger bar, press any of the 4 buttons with the right timing exactly/just before the small bar is full, you have 3 chances, what you had in the smaller bar when you pressed the button is added to the big bar, if your big bar is more full than the one of your opponent, you win the minigame, if the opponent's bar has more in it, you lose the minigame. if you win, you do massive damage, if you lose, depending on the character you launch an ultimate with, the opponent takes less damage, you take damage, and I'm not sure but if tien loses the minigame his ultimate does far more damage then if he had won. to increase your chances of winning the minigame, use dragon rush (pkge or R2 for hyper mode, then press e during an attack that launches your opponent) to raise the opponents fatigue, if your opponent is fatigued a lot, his bar in the ultimate move minigame fills up at a faster rate, thus making it harder for them to properly time the button press. I hope this helps a lot ^_^
Brawl: 0216 - 4937 - 1436 TRNC If you want to fail and you fail, did you fail?