Besides shutting down abilities, which is not ideal, there is no way for Volcanion to knock it out. You have two options to shut down Vileplume's ability, Garbotoxin and Hex Maniac. Hex is rotating out of Standard and you would never run Garbotoxin Garbodor in a Volcanion deck because you need access to Steam Up. You're only hope is to hope your opponent plays Pokèmon on the bench and you can Guzma around it.
I don't think you need to be too worried about seeing it competitively, but you asked how to counter it. The new Alolan Ninetales is a similar concept. If you put it out against an all EX/GX deck, there's no way around it if you're not playing anything to stop abilities.
Could be one of the prime reasons to run Salazzle GX.
Yeah I overlooked that. I just wonder if the Kiawe version of the deck is going to be the way to run the deck now.Beat me to it. Salazzle GX can overcome this, and in general is not a bad late-game sweeper. I would probably only run a 1-1 or 2-2.
Yeah I overlooked that. I just wonder if the Kiawe version of the deck is going to be the way to run the deck now.