Absol Prime is your best counter, since it can both soften the enemy with its Poke-Body as well as one-shot Chandelures.
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Zoroark is not a threat unless they slap a special dark or two and you flip tails.
I'd like to understand your reasoning more here. You're implying if it can't OHKO you, it's not a threat. But that Chandelure just got hit for 100 with a DCE, leaving 30 HP. At best you probably have two Chandelures on the board. How is that not threatening?