okay here is my idea-
tsukuyomi- i think pain would be immune to genjutsu of the occular type. for one reason he is proficient in genjutsu himself. another is that is is hard to tell if it would work against the rinnegan which is also a chakra sensing ocular ability. also since deva has no thoughts himself, it is possible that temporarily nagato can shut him off to avoid genjutsu
Amaterasu- shinra tensei would repel it causing itachi to waste his chakra
susanoo- same as amaterasu
his other techniques would be useless
tsukuyomi- i think pain would be immune to genjutsu of the occular type. for one reason he is proficient in genjutsu himself. another is that is is hard to tell if it would work against the rinnegan which is also a chakra sensing ocular ability. also since deva has no thoughts himself, it is possible that temporarily nagato can shut him off to avoid genjutsu
Amaterasu- shinra tensei would repel it causing itachi to waste his chakra
susanoo- same as amaterasu
his other techniques would be useless