NARUTO VS PAIN(BOSS BATTLE): I'm currently having trouble defeating..

Question for Naruto Shippuden: Ultimate Ninja Storm 2

NARUTO VS PAIN(BOSS BATTLE):

I'm currently having trouble defeating Pain in Ultimate Mission Mode(aka Story Mode). I can easily win the first part(Sage Mode) and second Part(Nine-Tails Sixth Tail), But When it comes to the 3rd part(Normal Naruto), Pain always substitutes, Combo attacks, and kills me. I've tried the Rasengan, normal Combos, Ninja Tools, Guarding, etc. And Throws don't work on him in that part of the fight. Also, whenever I try to substitute, it never works when I want it to. And I've tried like 7 times or more, but I just cannot win that last fight without getting KO'd. Plus I cannot use Battle items in that last fight. Please, Any helpful advice for beating Pain in the 3rd and final fight as Normal Naruto would be greatly Appreciated.

P.S. I cannot use Ultimate Jutsu, or awakening, and Opponent is immune to all bad status effects. Plus changing the difficulty doesn't affect story mode.

Please help! Thanks!