Mix and Mega Threat List
I was talking to Ghoul King, and because I wanted one made and it seemed a few other people did too, I decided to volunteer to make a threat list. Basically, I'd like to consider this a precursor to a viability ranking, since, sadly, this isn't playable yet. There are a plethora of options to play with in this metagame, and here's a place where you can share effective (and hopefully creative) sets.So, there was talk yesterday about a threat list. I messaged EeveeGeneral about getting a thread approved, but he pointed out that it would clutter the forum, and so he suggested I create one in the thread, and have it linked to the OP. He also generously offered to edit in a link into the OP in Flameusers absence.
Formatting:
(Use the sprites from here for your images please, just to make things nice and uniform.)

Noivern @ Pidgeotite
Ability: Frisk ---> No Guard
EVs: 252 SpA/ 4 Def / 252 Spe
Timid / Modest Nature
Hurricane
Draco Meteor
Heat Wave / Focus Blast / Boomburst
Nasty Plot / Focus Blast
Noivern with Pidgeotite is basically just Mega Pidgeot V.2. It can work effectively with a number of sets too, unlike Bird Jesus. It gets incredible 162 Spa and 143 Spe and no miss Hurricane, paired with passable bulk. Sadly, it falls just shy of reaching 145 Spe to tie w/ Sceptile, though that's not likely to be a problem here.
I can't wait to hear your ideas! Just reply to this post with your set, or tag me in your post, and (as long as it isn't an obviously trash set) I will add it to the list

Mamoswine @ Lucarionite
Ability: Thick Fat ---> Adaptability
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
Earthquake
Ice Shard
Icicle Spear
Freeze Dry
Freeze Dry Mamo is already great in OU, but now it has 165/95/102 attacking stats, and the incredible adaptability. When I first mentioned this set a page back, I pointed out that it has a very slim chance to ohko full defense Lugia- through Multiscale- w/ icicle spear. It's also capable of outspeeding ohkoing standard palkia w/ freeze dry. It has fxnally unresisted coverage with just its stabs, so it's basically as spamable as Lopunny now. It's speed also lets it outpace things with 101 Spe or less, including (just as some options) salamencite Landorus T, altarianite Lando I, and anything slower.

Roserade @ Red Orb
Abillity: Natural Cure --> Desolate Land
EVs: 252 SpA / 252 Spe / 4 Def
Timid Nature
- Weather Ball
- Leaf Storm / Solar Beam
- Hidden Power Ground / Shadow Ball
- Growth
Ever since we allowed the primal's orbs to be held by Pokemon, Roserade was always thought to be one of the best users of Red Orb, and it has lived up to this hype. Red Orb Roserade can preform the role of a great wallbreaker, Utilizing Desolate Land to do its job, giving it access to things like STAB Weather Ball boosted by both the sun and it's effect, a +2 special attack growth coming of it's impressive base 175 SpA, allowing it to deal massive damage to even Pokemon like Giratina and Sabelnite Blissey, and unlike some other Red Orb users out there, the ability to deal with Water type Blue Orb users, since when they switch in they fear having to take a STAB Leaf Storm, which really hurts. Unfortunately, Roserade is rather slow, so it doesn't like having to deal with fast mons like users of Pidgeotite, and it's rather frail with 60/85/105 defenses, so it does require a bit of support against these pokemon, but even with these flaws its still great none the less

Diggersby @ Medichamite
Ability: Huge Power ---> Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly nature
Earthquake
Swords dance
Quick Attack
Ice Punch
Standard OU SD bunny, V.2. This thing is fairly simple; set up swords dance and sweep. Ice punch is great for all the dragons that will inevitably pop up, earthquake is primary STAB, doing obscene damage to a lot of stuff. Finally Quick Attack to finish stuff off. And I mean come on- look at those cheeks!

Azumarill @ Mawilite
Ability: Sap Sipper ---> Huge Power
EVs: 252 Atk / 4 Spe / 252 HP
Adamant nature
Play Rough
Belly Drum
Aqua Jet
Ice Punch
And then Diggersby's cousin, Azumarill showed up. That's when things got really exciting... This thing sounds so good. 100/120/120 defenses are nothing to laugh at. Paired w/ 70 Atk and huge power- suddenly you have the scariest belly jet sweeper the world has never known. Unfortunately, it's not all fun and games for the aquatic rodent. It has NO recovery, so passing it a sub is a great idea, and hazard removal is a must. But after that- gg. It def requires some support, but who cares? It's worth it to sweep with one of the cutest mons to ever grace the OU turf.
After lurking a bit more I like this variant of the dragon nido better.
Nidoqueen @ Charizardite X
90/92/87/75/85/76
To
90/138/120/96/85/76
Nature: Careful (+SpDef - SpAtk)/Adamant (+Atk - SpAtk)
Evs:248 HP, 252 Atk, 8 SpDef / a more optimized variant
Dragon Tail
Poison Jab
Stealth Rock/Sucker Punch
Torment/Sucker Punch
The goal of this set is to bulk through and shuffle the opposing team. It's built with respectable 90/120/85 bulk, but what makes the set is Torment: its only weaknesses are ice, ground, psychic and dragon, and only a handful of pokemon carry more than one of those types at a time. Its bulk is therefore augmented, and it can attack and shuffle accordingly with its Tough Claws boosted stabs and priority. it can eschew priority or torment for Stealth Rocks, which it can set up in many instances thanks to its good defensive typing.
Resistances:
water, fire, poison, fighting, electric, bug, grass(x4)
Weaknesses:dragon, ice, ground, psychic.
I think it could be touched up a little but it could do well against the many new fairystoners that will be popping up and could be a good check to a handful of other things.
Nidoqueen @ Charizardite X
90/92/87/75/85/76
To
90/138/120/96/85/76
Nature: Careful (+SpDef - SpAtk)/Adamant (+Atk - SpAtk)
Evs:248 HP, 252 Atk, 8 SpDef / a more optimized variant
Dragon Tail
Poison Jab
Stealth Rock/Sucker Punch
Torment/Sucker Punch
The goal of this set is to bulk through and shuffle the opposing team. It's built with respectable 90/120/85 bulk, but what makes the set is Torment: its only weaknesses are ice, ground, psychic and dragon, and only a handful of pokemon carry more than one of those types at a time. Its bulk is therefore augmented, and it can attack and shuffle accordingly with its Tough Claws boosted stabs and priority. it can eschew priority or torment for Stealth Rocks, which it can set up in many instances thanks to its good defensive typing.
Resistances:
water, fire, poison, fighting, electric, bug, grass(x4)
Weaknesses:dragon, ice, ground, psychic.
I think it could be touched up a little but it could do well against the many new fairystoners that will be popping up and could be a good check to a handful of other things.

Dragonite @ Altarianite
Ability: Multiscale
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Extreme Speed
- Dragon Dance
- Roost
- Substitute
No clue on EVs, but this is basically Altaria with Extreme Speed instead of Return. If Dragonite got Swords dance instead of Dragon Dance, this would truly be probably the funniest thing of all time. Except funny in a bad way. A bad way that makes you wish Extreme Speed wasn't a move and that Pixilate wasn't an ability.

Noivern @ Altarianite
Ability: Infiltrator -> Pixilate
Type: Flying/Fairy (I have been informed that Dragon is actually Noivern's secondary typing. Thanks, GameFreak.)
Stats: 85/110/100/137/80/123
EVs: 4 HP/252 SpA/252 Spe
Modest Nature
-Boomburst
-Fire Blast
-Roost
-Hurricane
And you thought Gardevoir was scary. (It is.) Alright, so this is only 137 SpA vs. Gardy's 165. Noivern simply makes up for that with a higher-BP move.
I'll admit, I just wanted to make something good for Boomburst, but Noivern's just the mon to do it, with amazing speed and pretty respectable bulk at 85/100/80 with Altarianite.
Boomburst, what with its 140 BP stacked with Pixilate and STAB while carrying zero drawbacks, is the primary attacking move. If you've seen Mega Gardevoir or Specs Sylveon in action, you know what this can do (albeit with its lower-powered cousin). Fire Blast hits Steel-types super-effectively. Roost recovers, of course. Hurricane is secondary STAB and thus the primary option for the final slot to break through Fire-types that otherwise wall this set, but use caution because of Hurricane's notoriously shaky accuracy. The EVs max out Special Attack and Speed, with a Modest nature being chosen because that lowly 137 SpA could be a problem.

Klinklang @ Altarianite
Ability: Clear Body --> Pixilate
EVs: 4 HP / 252 Atk / 252 Spe
Adamant/Jolly Nature
- Substitute
- Shift Gear
- Gear Grind
- Return
Stats: 60 / 140 / 135 / 110 / 85 / 90
With decent bulk augmented by a fantastic defensive typing, it's not easy to stop this beast from setting up, especially in late game. Shift Gear lets it outspeed all but the fastest threats in a single turn, and it has access to two very strong STAB moves in Gear Grind and Pixilate Return. With all the other Altarianite users running around, Steel type STAB will be invaluable in this meta, and Altarianite Klinklang has some of the best.

Blissey @ Slowbronite
Ability: Serene Grace->Shell Armor
Stats: 255/10/80/105/135/55
EVs: 4 HP/252 Def/252 SpA or 252 HP/252 Def/4 SpA
Modest or Bold Nature
-Hyper Voice
-Shadow Ball
-Calm Mind/Toxic
-Soft-Boiled
Bulky offensive threat. Hyper Voice and Shadow Ball achieve rather neat coverage, Softboiled for recovery, and either Calm Mind to become the special wall you know and love with an extra side of power or Toxic. I've put a couple of EV spreads here, the former being better for bulky offense, the latter for stall, which can run a standard Blissey set otherwise. Bold nature helps out with Defense, Modest gives you more power.
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