Seeing as Volcanion discussion is going on, I figured I'd weigh in a bit. Sorry for the super long post, that's a recurring problem with me lol
I'm definitely thinking specs Volc is going to be the best set (though this already seems to be the general consensus), if just because Steam Eruption is so damn spammable bar it's PP. Of course, I'm an offense player so take that with a pinch of salt, so Defensive might have some merit. Shuca could be nice to alleviate the ground weakness, but no ground type is switching in on a Volcanion with the possibility of specs anyways, and Steam Eruption is already going to sting like a slap on the cheek, if said slapper had a hand the size of my house. Steam Eruption is basically a bulky physical attacker's worst nightmare, with the power of Hydro and the Burn Chance of Scald. 180 speed EV investment is probs going to be the best speed investment in order to outspeed Defensive Lando and non-offensive Heatran - It's what I EVd for initially in the OM Unreleased OU. I'm not entirely decided on it's ideal coverage, but pretty certain about Sludge Wave/Bomb being there to nail Azu. Speaking of Azu, I think this will probably be the best BD Azu/Azu in general check around, as it outspeeds and OHKOs with Sludge W/B and completely walls it's STAB, which is really nice because BD Azu is REALLY difficult to beat sometimes. I'm liking the idea of Earth Power on Volc to nab Raikou/MMane and other Volcanion on the switch, but HP Grass gives it a better stall matchup, nailing things like Quag, Seismitoad and other Water Absorb mons like Jellicent or something. I don't see Focus Blast being that good as most FB targets are already hit SE by Fire Blast. It's probably going to be EP/HP Grass on the eventual Analysis and vice versa. It's not uncounterable, Jellicent, Slowking and some other super fat waters exist.
I'm looking at the attack stat and wondering if there's potential for a mixed set. It's definitely not going to be it's best set as Specs has enough special attack and coverage to 2hko most of the tier anyways, but maybe Superpower can be run to hit Chansey or something, who otherwise completely walls it out (of course it does it's freaking Chansey what special attacker other than Keldeo and Specs Psyshock/Drain Punch Hoopa DOESN'T it wall?). It'd probably be mostly special with Superpower as the last moveslot for Chansey, and Life Orb over Specs. Unfortunately, it'd need a lot of attack investment to actually 2hko, maybe so much that it probably wouldn't be that effective outside of luring Chansey. Earthquake could probably damage Raikou a bit more, but would be a bit impractical outside it as it hinders it's ability to hit MMane thanks to Intimidate, Raikou is already chunked by Specs Steam Eruption, and is reliant on hitting it on the switch as a sp.def dropping nature is mandatory to avoid dropping Volc's already poorish speed even more. On the plus side, it hits Dragalge for better damage, I guess, but Earth Power's already doing huge damage to it with specs anyways and Dragalge's not that common to begin with.
Also, a moment of peace for Keldeo, who will probably lose it's title of "Most Difficult Water Type To Switch In On in OU" to this monster. Of course, Keldeo'll be viable as ever (neat defensive typing letting it check Dark Spam, MUCH faster, SS hits physically on special sets to beat The Pink Blob), it's just that it's probably not going to be the immediate go-to water type special wallbreaker anymore. As in, when people think Water Type Wallbreaker, they don't immediately think Keldeo and how oh ffs they'll need a super fat grass to switch in and oh for the love of god what about SubCM, and so on. It'll still be damn good, just not the unequivocal best.
