First, Pick a character. It looks best with Goku. You must have teleport, and Special Move. Next, Lock on to a character. Start the Special move, and Charge it. Before it fires, Use teleport. You will end up behind your target. Release to Fire your Warp Kamehameha/Galick gun/Masenko/etc.
Beat the game under any difficulty setting to unlock Yamcha's, Krillin's, Tien's, Bardock's, Broly's, Trunks's, Goku's, Vegeta's, and Gohan's hidden forms.
Beat the game once, and you'll unlock the Pendulum mode. In this mode, you can replay any chapter you like, with any character you like; Including some hidden ones: Broly, Bardock, Krillin, Tien, and Yamcha.
On the character selection screen on pendulum, put both controllers on Broly. Press A at the same time and You and your friend or brother,etc. will be the legendary sayan!!
Go to controller menu in the pause menu and enter Up, Left, Down, Right, Start, Start, Y, A, X, B
Go to the controller menu in the Pause menu and enter Down, A, Up, Start, Start, Right, Left, X, B
This cheat must be re-entered in each level.