Hi! I'm a newbie!
I'm looking for the special moves of Fightin' Spirit too. What is that "TheZone" and how can I access to it?
If you want I have the cheat to play as the secret characters (Shingi - the Kento's rival - and the ninja - I don't remeber his name, he is the final boss)...
Go in the Options Menu, after select the Exit option so push and hold RIGHT for a few seconds, the screen will blink. The game logo will change in Super Fightin Spirit and in every game mode you play you can select the secret characters (press LEFT on Kento once for the Ninja and twice for Shingi).
If you show me how I can download the manual, I will show other nice cheats for Fightin Spirit!