A Fabled Hongmoon Secret Technique That Can't Be Found

[SosukeRyugamine]

How do you unlock this skill? Or does this message basically mean it's future content? 

[Marcello]

I have the same problem, anyboby have an answer for that??

[Cor]

Cann't be unlocked, it doesn't exist and maybe never will.

[Alanstar]

I think it will be unlocked in the future content... just not now. Keep waiting and sooner or later, it will be added to the game.