@ Black Belt
Dark/Fighting is much better coverage, but the main perk is base 155 attack without life orb recoil and the continuation of its defiant prowess. Its new typing is very weak to fairy but has very few checks due to iron head still hitting pretty hard. It obviously loses to steel/fairies, but this thing absolutely good vs offense.
@ Silk Scarf
@ Metal Coat
@ Black Belt
@ Soft Sand
All 3 are solid options, getting rid of Dnite's useless flying type. Normal gives it stab extremespeed, although it has quite a few weaknesses, and makes it both a great revenge killer and cleaner with high power. Metal Coat gives it tons of bulk and the treasured Dragon/Steel typing, while it retains the coverage to hit other steels and the inevitable steel/fairies that will plague this metagame. Black Belt adds STAB Superpower and a nice attack boost, which is actually great on Dnite because Superpower will hit very hard after a boost. Soft Sand is only viable in a traditional sense because of the presence of steel/fairies that will try to switch into a boosting Dnite not knowing what set it is. Multiscale makes this a potential staple of this metagame, as it is in so many OMs.
@ Magnet
@ Black Belt
The savior of offense vs stall, Magnet gains a nice speed boost and has a lot of power for special sets, while black belt has a nice physical boost. Neither are ideal because it's not secondary dark, but the former especially can do work against stall.
@ Black Glasses
@ Black Belt
Again, powerful pivot and rock setter that has a nice typing and great coverage. Ground/Dark is already very potent as we see from krookodile, and to be more bulky and MUCH more powerful alongside a better movepool is very nice. Regular sets such as scarf are still very viable the way this meta is shaping up so far. Leave defensive sets to its normal forme or other, better mons; the lack of lefties recovery is very painful.
@ Miracle Seed
@ Nevermeltice
Miracle seed gives stab energy ball and goes the bulk route, having 100/115/115 and a great defensive typing, especially for this metagame where flying moves will be uncommon. Nevermeltice is a more offensive route that has good speed and great power for a very small sacrifice in bulk, and the typing is not bad. Stab Ice is obviously great as it is in every other meta.
@ Blackglasses
@ Dragon Fang
@ Charcoal
Serperior has many viable sets, since the spA boost is incredibly useful and the ability to change type is nice too, gaining stab on something else. Blackglasses gives nice boosts, Dragon Fang adds stab dragon, Charcoal adds stab HP fire which could be really useful alongside that +25 spA. I would recommend using a speed boosting item if possible; its speed is one of its biggest perks and I have a feeling speed tiers for fastmons are going to be very high.
@ Magnet
Best offensive spinner in the meta, hands down. Use this thing. Good power, great speed, manageable bulk, great typing offensively and defensively, tons of utility. I'm very happy we finally have a meta where offense will have reliable hazard removal. This thing will also define fastmons in this tier.
@ Magnet
@ Twisted Spoon
@ Blackglasses
@ Metal Coat
@ Black Belt
Such a versatile offensive mon in all tiers, and this tier only makes it better. Retaining Prankster Thunder Wave is huge for both offense and balance, and its good movepool makes it a perfect mon in this meta. Magnet is an all around power boost and the typing may catch people by surprise. TwistedSpoon gives it 150 SpA and 126 Spe, making it a great Nasty Plot abuser with stab Psychic. Blackglasses has stab Dark Pulse for less speed, also gaining some physical bulk. Metal coat is a surprise choice that would catch a lot of opponents off guard, while having a wonderful typing, stab flash cannon, prankster twave, and decent bulk. Black Belt has stab Superpower, no surprises there, and is a go to for physical sets.
@ Metal Coat
Iron Tail isn't a great stab, but this thing's bulk is amazing and it can coil against a very large portion of the meta. Dragon/Steel is going to be a great typing and this mons' ability to beat both stall and offense with its bulk and ability to boost means it is a major threat.
@ Silk Scarf
Stab explosion + hazards + taunt + decent power. Cool HO lead for pimps who don't want to be mainstream, and that's a good thing. It can probably run other sets with the ability to better its stats, but its lack of bulk holds it back in other roles.
@ Soft Sand
You thought this was scary for stall before? Moldy EQ is good as ever, and with stab and even more power, this thing is absolutely devastating vs stall teams and has the power to do work against offense as well. Overall a great stallbreaker in this metagame, especially since steel spam will be prevalent.
@ Charcoal
@ Magnet
@ Spell Tag
Yeah this thing has TONS of potential. Mainly its potential resides in its extreme versatility, as it can run a myriad of sets while retaining stab dark and all kinds of coverage. It can go mixed, full physical, full special, pivot, and do almost everything. Losing STAB Draco hurts, but you won't be running this for Draco Meteor.
Other mons with potential:
Gyarados (hard rock? limited physical movepool isn't fun)
Heatran (all kinds of typings are possible and flash fire will give it switches, while the unpredictability will make it a nice rock setter for balance)
Hippowdon (Its already massive bulk and reliable recovery could make it really good, and the right typing will do some serious work)
Mew (because it can run anything)
Slurpuff (stab drain punch and more bulk or something else? Belly Drummers unpredictability could be a huge asset, even without sitrus)
Salamence (Intimidate/moxie is a great ability combo and this could run a bunch of sets with its movepool)
Tyrantrum (A type change for some more speed or bulk would be really nice for it, and in general its dragon typing isn't very helpful besides outrage).
This is fun. I like how anything can combo anything without becoming ridiculous. Hopefully this gets coded soon. Anyways, How would Meloetta work with relic song? Would Fighting override the secondary typing and it get the item boost?
Note that some of my ideas were stolen while i was making this post xD