>>28378789Yes it can get the job done vs Fairies, but the fact is Muk or even the Nidos are way better at that niche for multiple reasons.
Be resourceful and use whatever is currently available to you but don't waste precious stardust on things that will be outclassed by future dex entries. That's my advice.
Also both relevant Fairies run Pound as their optimal primary move so it's going to be taking neutral damage from everything but their charge moves. This applies to Muk and the Nidos as well but at least they have the bulk to take those Pounds while dishing back SE Poison Jabs. Another thing to keep in mind is that Arbok actually does higher DPS with Bite instead of its STAB Poison move so essentially an optimized Arbok will be hitting Fairies for NVE with its charge moves. But if you have one with Acid/Gunk Shot it will be able to get the job done.