Goku 4 Encarnation of Saiya
In the title screen press Right Left Down Up Right Left Down Up Triangle Triangle Triangle Triangle Triangle X X X X X X X X X.
Play as SS Gotenks
Beat the game on Hard 9 times with Regular Trunks and without dying. Now go to Trunks and press Select9x.
At the Title screen press Right Left Down Up Right Left Down Up. If done correctly you will hear a sound.
Wire Frame Characters
While choosing your fighter hold Select.
In TwoPlayer or Training Mode and when choosing your fighter press Square X Circle.
At the Title screen press L1 L2 R1 R2 Start. Then after choosing a song press Select to view the lyrics and additional song info.