This requires the use of an Action Replay
Turn on the "always power shot" Action Replay code, and play as any character. While the Power Move scene is showing, repetitively press A+B. If done correctly, weird stuff should happen: some times you'll hear a big BOOM and the Power Shot will be a lot more powerful, sometimes you do a offensive AND defensive shot at the same time, sometimes they will be stuck in a weird pose (this aspect only seems to work with Donkey and Diddy Kong), and sometimes you will be floating in mid-air while hitting the ball. If you press A+B too much, then the game will freeze.
Submitted by: Giga Bowser X