Well, as I remember my Zorua evolved at LV.30. (not really sure cuz I stop the evolution and gave him an everstone so it wont evolve.Lol)
But other resources said that it evolved at LV.20
If you want an evolved Zorua(Zoroark) you can get Zoroark instead by bringing Raikou,Suicune and Entei to Lostlorn Forest. You have an event that get you to battle a female Zoroark at LV.25.
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you can evolve it at level 30 source=serebii.net
I received a zorua today from one of the seven sages and I learned zorua officially evolves at Lv.30.hope this helps!
you get a zorua in viridian and evolve it
you cant evolve pusle but on the pc pokemon lake game if you pick zoura as your starter you can evolve it into zoroark
probably not because its highly rare and it hasn't been out yet...