
Volcanion is by all accounts one of the best Pokemon in modern XY DOU, dominating tour usage and topping the viability rankings, but recently the playerbase is starting to feel like its omnipresence is starting to feel restricting in the builder and in practice. XY is a tier that's all about trading, since a lot of the super safe switches that exist in later gens aren't available to you here. That means for every turn, a lot of progress is generally made and the games are about pushing harder than you're being pushed.
Volcanion has strong matchups against all of XY's top threats. Even Choice Banded Landorus-T can't OHKO Volcanion but easily picks up a revenge KO with Steam Eruption. Mega Gengar, Thundurus, and Kyurem-B struggle to deal considerable damage to it. This means Volcanion gets multiple turns to sit on the field and click Heat Wave and Steam Eruption and fish for burns, which are huge in a 1/8 burn gen, no 50%, no misty terrain, and a tier where very little top Pokemon run recovery moves.
Truthfully Volcanion has no hard counter. The closest thing we're seeing in recent XY is Porygon2, which can chip it with Thunderbolt (bulky P2 thunderbolt @ +0 is a miniscule chance to 4HKO btw). But even that's prone to getting Trapped, Seismic Tossed, Slept, or Set up on. Gastrodon is already a fringe Pokemon at best, but AV (or even non AV) sets can pretty freely run HP Grass to 2HKO it while not taking too much damage in return.
Its presence also harms meta diversity, and while that should never be a forefront of tiering, having megas like Charizard-Y and Gardevoir be more playable would certainly benefit the health of the tier as we can move away from so many Gengar and Kangaskhan mirrors/face offs.
The last point I'd like to bring up in the OP is that Volcanion isn't really necessary for checking anything. I bring this up because a lot of the time people ask for significant reason to alter old gen metas, but trust that Volcanion is one Pokemon the tier can do without. Anyone remember Heatran btw?

Much to Memoric's dismay, I am also taking the time to make this post about Mega Salamence. While I wasn't around during Salamence's suspect/banning, it would be an understatement to say this decision is controversial among the modern community, so much so that we hosted a XY + Salamencite tour in the Doubles forum earlier this year. One thing that's different now compared to 2014 is that the tier no longer has Jirachi to support it, which is huge for it to lose a Fairy/Ice-resistant redirection user.
While I didn't play the free mence tour, from what I can gather it seems like the reception was that it wasn't breaking the tier or anything like that. Just going by the common mons in the tier, there are plenty of reliable checks/counters like Mega Manectric, HP Ice/Wow Mega Gengar, Thundurus, Landorus-T, Kyurem-B, Porygon2, Cresselia, physdef Sylveon etc.
Admittedly I don't have much else to say about Mence which is why I'm hoping opening up more discussion can help us determine how to proceed, if at all. Some more points in its favor are the aforementioned Mega diversity = meta diversity claims and another Pokemon that seemingly helps check Volcanion (though I'm sure it's only a matter of time before it'd start running HP Ice but I digress).
So how do we proceed? Similar to what's happening with ADV UU right now, I'd prefer if these votes be staggered if we decide to take on action on both. However, by no means am I saying that action must be taken or anything, but I think it'd be really nice to start the discussion here.
Tagging the following users, which could serve as a potential voting list. (22/26 total)
ORASPL DOUers: stax umbry Shadowmonstr7 Arcticblast zee Toxigen Grandmas Cookin Tenzai SingleThunder Akaru Kokuyo Memoric
XY Cup Top 8: Fangame10 Amaranth Yuichi txitxas Mishimono
DPL XYers: qsns JRL KyleCole Voltix miltankmilk
XY Council: SMB
Free Mence Tour top 4*: Actuarily Yoda2798 Spurrific DaAwesomeDude1
* the free mence tour was an unofficial forum tour but given these are some of the only players that have won multiple games with mence included it felt appropriate to include them as well.
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