Hm, guess I'll comment on a couple of more things in greater detail
Edit: DISCLAIMER: Ended up being more than a couple. Wall of text approaching; you've been warned.
Kyurem: I haven't really used it much, but this thing is as good as advertised. No Escavalier? Something dies. It's that simple. I like a Roost + 3 Attacks LO set with DM, Ice Beam, EP/HP Fire. Roost lets it just not give 2 fucks about resisted hits it comes in on. If the opponent has Escavalier, just Roost and switch out as you wait for your teammates to take it out (or put it in sure KO range of HP Fire) Base 95 Speed isn't amazing, but it's certainly good enough. Specs is a nuke. Scarf is a solid revenge killer, but hazard control is nice, especially with the latter. SubRoost can be really annoying as well. Haven't run into a HC set yet, so I'll reserve judgment on it.
Shaymin: This damn thing is so annoying. One of the biggest threats to the current team I'm running as I have nothing to take a lot of repeated hits from it. LO sets have really good coverage and high enough Speed to be a pain. Natural Cure means you can't cripple it. Bulkier SubSeed sets are a thing, but I think it's a waste of Shaymin's offensive potential. Oh, and Scarf kinda reminds me of Mesprit from BW RU... only faster and with a better STAB to abuse. Scarf Healing Wish clutches games; end of story.
Raikou: Specs, CM+3 Attacks, SubCM, AV, and even MonoCM. Honestly, Raikou can perform p. much any special attacking role you need it to. Scarf is a little wasted on it, but if you want to outspeed all of the things, there you go.
Rhyperior: Another new drop, but this guy is a beast. The Weakness Policy set posted a page or two ago is something that should be feared. Haven't run it myself, but it looks damn scary since Solid Rock powers down super effective moves. It is an absolute monster in Trick Room. Basically run LO / CB and watch it wreck shit. STAB EdgeQuake is scary as hell coming from this thing. Worst part is that Rhyperior can take on Reuniclus and Escavalier by itself and demolish them so its own TR team can have free reign. I've also found success with a bulky tank set with SR, EQ, Rock Blast, DTail. Hard to deal with if you use with Froslass since DTail amplifies the Spikes Froslass lays down and it isn't like Fairy-types are willing to switch into Rhyperior.
Moltres: Old face, same major threat. One of the absolute best answers to Shaymin and it also shits on Escavalier, a majorly buffed threat from BW. Its moves hay have had their power lowered, but it still isn't any less dangerous. LO + 3 Attacks, Specs, SubRoost, Scarf, take your pick. Great mon and how can you complain with something that can reliably answer Shaymin?
Druddigon: This (BAN ME PLEASE) is still here. TR makes it more of a beast. TR teams are amazing right now. So, Druddigon is still a massive threat. Hits like a truck, has solid bulk, and is really slow. It's a near shoe-in for Trick Room, but there are things like Esca, Rhyperior, and Mega Abomomasnow to choose from as well. Oh, and AV can give it insane special bulk.
Toxicroak: I've already talked at length about Toxicroak, but it is really damn cool. It's pretty damn frail (Shaymin 2HKOes with LO Seed Flare...) but if it sets up, good luck. Power STAB in Gunk Shot. Priority in Sucker Punch. Healing STAB in Drain Punch. Hope you have a Gligar if it sets up successfully.
The last one I want to talk about is something I playtested as I was trying to find a 6th member of my current team, and that's Delphox. While I didn't end up leaving it on the team, this thing has the potential to be really good. P. much outclasses Typhlosion in every way. Slightly stronger, slightly faster, secondary STAB to hit bulky Waters, and Trick to fuk over any wall its Specs set can't break. That said, I want to draw attention to its Calm Mind set. There aren't many faster physical attackers than Delphox (CB Azelf sucks a ton though) and it already has solid special bulk. You can come in, CM, and just sweep rather reliably. Even if you don't want to sweep with it, you can use it in the early or mid-stages of a game to inflict major damage on common cores. Here's what I was using:
Delphox @ Life Orb
Ability: Blaze
EVs: 252 SAtk / 4 SDef / 252 Spe
- Calm Mind
- Fire Blast
- Psyshock
- Grass Knot
Come in, setup a CM, wreck shit. Base 114 Special Attack is really good and the coverage Delphox gets, while limited, is really solid for RU. Fire Blast nukes stuff. At +1, only the bulkiest of resistances can handle the move. Psyshock is amaaaaaazing. Wrecks p. much anything that wants to come in on a Fire Blast. Think Moltres, Druddigon, most AV users, and SpDef Jellicent. Grass Knot fills out the set as it donks Rhyperior, Slowking, Gastrodon, and Omastar.