Shikamaru is weak but smart. In this fight he has:
1)2, 3 tomoe sharingan at beginning of fight
2)Mangekyo sharingan
3)Kamui
4)Susano'o - up to second stage
5)Normal Rasangan
6)normal Chidori
7)Asuma chakra blades
8)His original tech's like shadow mimic
9)Suffers from overuse of sharingan, with slight blindness and chakra loss
VS
Alive itachi, full health and prime with a brand new MS.
Who would win?
1)2, 3 tomoe sharingan at beginning of fight
2)Mangekyo sharingan
3)Kamui
4)Susano'o - up to second stage
5)Normal Rasangan
6)normal Chidori
7)Asuma chakra blades
8)His original tech's like shadow mimic
9)Suffers from overuse of sharingan, with slight blindness and chakra loss
VS
Alive itachi, full health and prime with a brand new MS.
Who would win?