During the character select screen press and hold the following: Down+L+R and select your character. You now have access to all your hidden special attacks and desperation attack.
Fight as the same exact character
Highlight the character and press Y at the same time.
Play The Japanese Version
To play as the easier Japanese version, sequentially and repeatedly press B, A, X, Y at the white screen with the Jaleco logo until it disappears. If done right, you'll arrive at a glitched screen. Now, press Start, then Down three times and Start again. You'll be at the options screen and when you exit, you'll see the Japanese title screen. Now start your game and enjoy the original version of the game.
Title Change
When the "Jaleco" screen appears, begin pressing B, A, X, Y repeatedly. If you do it fast enough, a scrambled screen will appear. Wait until you hear a sword slash sound, then press Start. When the screen changes, press Down, Down, Down, Start. On the Options screen, select "Exit." This trick allows you to change the name of the game to "Rushing Beat."
Also, some of the characters will have different names and the dialogue will be in Japanese.
Title Screen Tricks
At the Jaleco logo, press B,A,X,Y repeatedly, at the sword slash press Start, as the screen changes press Down,Down,Down,Start.
Color Test...