Fight as Kaede:
Highlight Rain at the character selection screen. Then, press Down(2), Left(2),
Fight as Rai-On:
Highlight Byakko at the character selection screen. Then, press Up, Down,
Left(2), Right, Left, Up.
Fight as Evil Gamof:
Highlight Gamof at the character selection screen. Then hold Start and press A.
Expanding and shrinking Gore:
Select Gore as a character and configure the controller layout to have your
taunt on. You can make Gore's head grow by pressing the corresponding button.
Roll the D-pad back and forth while pressing the Taunt and he will shrink down
and remain that size until the move is repeated.