What is strongest rival in naruto gekitou ninja taisen 4?

I can%26#039;t unlock Kisame, Kabuto, One tail kyubi naruto etc because when I go to other websites it says I have to fight their strongest rival in the S rank mission.|||Ok i delt with this and its a pain, i have the japanese version and ALL CHARACTERS. To get the shark guy *i forget how to spell his name* kisame? you must do the S rank mission Strongest Rival, you play as Guy and fight Kisame, when you beat him, you unlock him. Pretty much do this. Complete ALL missions from D to S, yes ALL of them. and they are hard as a son of a gun. i recommend using Lee and opening the gates for harder battles to quickly end them, or using neji or orochimaru for they both have chakra draining abilities.