Pein vs Itachi.

[curse seal sasuke 2]

itachi will do it like this
Step 1)activites ms
Step 2)uses amataretsu
Step 3) susanoo
Step 4)uses susanoo sword
Step 5)cuts and burn pein in the same time by the susanoo sword

 

[sharingan warrior]

i doubt it itachi could just burn pain with amaterasu to death and pain is not fast enough to catch itachi so yea