Hi . I'm sorry because of English .
I'm re-telling some parts of story to make sure I'm correct ... So correct me if false ;
Zetsu's goal was to fool someone to awaken the RinneSharingan and then revive Kaguya ... Zetsu re-wrote the stone Hagoromo left and wrote a method to awaken RinneSharingan .
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Kaguya was the first one to awaken RinneSharingan by eating shinju's fruit .... And Zetsu didn't see a person awakening RinneSharingan ...
.
.
The question is "How did black Zetsu learn the method of awakening RinneSharingan ???"
I'm re-telling some parts of story to make sure I'm correct ... So correct me if false ;
Zetsu's goal was to fool someone to awaken the RinneSharingan and then revive Kaguya ... Zetsu re-wrote the stone Hagoromo left and wrote a method to awaken RinneSharingan .
.
.
Kaguya was the first one to awaken RinneSharingan by eating shinju's fruit .... And Zetsu didn't see a person awakening RinneSharingan ...
.
.
The question is "How did black Zetsu learn the method of awakening RinneSharingan ???"