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Make Zoroark Dark/Fairy, which it should be theme-wise.
It's a one-trick-pony in its current form.. so give it a HA that is a variation of "Illusion": Now Zoroark will take the shape of a random team mate each time it is switched in. This will take away some control, but has the potential to confuse the opponent. And instead of changing back into its real form as soon as it gets hit, it will only change back when its HP get under 50%. So hazards, recoil and residual damage could potentially turn it back, too.