Start a new game with the name Golf_Gone_Wild.
During play, hold R and press White, Back, White, Black, Back. You will hit balls perfectly.
During play, hold R and press Black, X, Black, Black, X. This only works if you do not have any Beating Tokens.
During play, hold R and press Up, Left, Down, Right, Up, Left, Down, Right, X, X.
In a two-player game, press A when the other player is swinging to taunt them.
At the Character Select screen, hold the L trigger and press Y, Y, White, Y, Black, Y.
Change Ball Size:
To increase the size of the ball, hold down the R trigger and press Up, Up, Up, Down. To make the ball smaller hold the R trigger and press Down, Down, Down, Up.
Thanks to Revolution readers Bart Maloney, woudrew, Matthew Cunigan, Katacomb, BaseBallGuy23, Jesus Garcia, and Ryan!