IN STORY MODE,

CUSTOM TEAM FOR ITACHI,GUY,AND JIRAIYA.

USE ALL THEIR SKILLS ON BOSS FIGHT 

AND ITS A VERY VERY VERY HIGH CHANCE OF WINNING 

AND MAKE SURE U USE ITACHI TO FIGHT

always use kakashi because he always imitating his self when you use sharingan

beat hard mode to get jiarya tsunade and orchimaru. beat insane mode to get itachi and
kisame.in insane mode pickguy jiarya and gaara because they lower alot of opponet health
but use it when you reach stage 8

to unlock kakashi,guy use neji,sasuke,naruto to beat them just use first
neji then sasuke and then naruto and when you are in other stages dont use any skill exp.
for kakashi,guy.

kakashi lighting blade (for the best opponates)
neji 8 tiragrams 64 palms(best so u can power up ur chakura)
last one................orochimaru (so u can seal there chakura)

if you wanna do the extra hit, here's how:

attack an opponent with the buttons O+up, then do the rush by rapidly pressing X 3 times.
press a directional button and there you go. easy as 1 2 3. extra hits are served to
destroy your opponents.

Itachi is the strongest you can get him by beating insane mode in heroes mode....

use orochimaru guy and tsunade when u reach the last stage first thing u do sett your
characters then go to skill then use orochimarus skill use it to seal the chackra of
kizame and itahci once finsh use also the skill of guy and tsunde when the fight starts
itachi and kizame will no longer can use their substitotion then the story mode is done
thanks for reading