In my opinion for a Zoroark is that It can be a good lead as long as a pokemon when disguised as is not a Ground, Rock or Steel in the sandstorm due to it can take damage telling if for example. If I lead with a Zoroark and the opponent leads with a Hippotas(how do I spell it) with eviolite. Your Zoroark is disguised as a Flygon but due to Flygon being a Ground/Dragon Type but it can still take damage from the sand, then its a Zoroark. I only used it in PO battles because on my Pokemon Black None of my pokemon are ready for battle because I dont have the proper way to get 100s via PokeSav or gen because I use action replay sometimes but its not working anymore so I cannot do Wifi battles other then PO.
Back on topic: Seeing that Zoroark can be abit Frail because of the bad points are its Defenses but it has Decent Speed and offensive stats. the Moveset and EVs I used are the following bellow
Choice Specs and Modest
Alternitvely I could use HP Ice to counter Flygons or Gligars If I encounter one by replacing grass knot as a filler move. Choice Specs Zoroark with modest nature can be a monster when played correctly but bad thing about it is Scarfed users can outspeed your Zoroark and take it out. To fix the speed, Give it a Scarf or Have your Zoroark timid nature. Seeing I prefer Scarf Modest over Timid and Scarfed, Zoroark Can outspeed every thing but You wont do as much damage as Choice Specs/Modest Zoroark. That was my opinion on a Zoroark
P.S: Excuse my bad english
Pokemon White team: Dewott, Zebstrika, BronzorDW, DuskullDW, Swadloon
Pokemon black team: Excadrill, Sawk, Servine, Simpour and Damaruka
Pokemon HG team: Totodile and Spinarak