I hate it when people says Tsukuyomi is unbeatable. In the manga Sasuke got hit by Tsukyomi during his 3rd and final battle with Itachi and he “overcome” Tsukuyomi.
Here read this and how Sasuke overcome Tsukyomi doesn’t have anything to do with the Sharingan
http://www.onemanga.com/Naruto/388/14/
I bet Ichimaru Gin can overcome Tsukuyomi just like Sasuke did. But if Itachi Uses Susanno then he’ll be even with Ichimaru because of Yata’s Mirror which deflects every attack.