Night Daze is a cool Dark-type move of Zoroark. And the other Dark-type Pokemon seem can't use it. So this is a signature move of Zoroark?
No is not.
Lunala can learn it at Lv.37
>Night Daze (Japanese: ナイトバースト Night Burst) is a damage-dealing Dark-type move introduced in Generation V. It is the signature move of Zorua and Zoroark.
As said above, yes, Night Daze is the signature move of Zoroark.