Hi :) We're like 2-3 days into the USM meta right now, and Ultra Necrozma has been really fun to use so far. It has a great matchup against so many teams as a sweeper and its movepool and stats are both great. Dusk Mane Necrozma is pretty much inarguably the better forme to use, since Necrozma's physical movepool is better, it's harder to break through special walls, and access to Swords Dance is really nice. I think this thing has potential to be really good with different sets, but so far I've been using this one:
Necrozma-Dusk-Mane @ Ultranecrozium Z
Ability: Prism Armor
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Photon Geyser
- Swords Dance
- Stone Edge
- Rock Polish
It kind of sucks that it has to hold an item, but at least this item is really good in that it gives two things. Necrozma is kind of strapped for moveslots considering it has a bunch of moves it wants to run: Photon Geyser and Swords Dance are given, Stone Edge is nice for Lugia, Ho-Oh, (sort of) Celesteela, and Yveltal, X-Scissor can be cool for Arceus-Dark (bit niche though), and Rock Polish allows Necrozma to not get revenge killed by Mega Gengar and Choice Scarf users like Yveltal and Xerneas. I personally like using Rock Polish because a lot of people don't expect it and rely on Mega Gengar or their Choice Scarf user to be able to revenge kill it, but it's all preference. You can also run Earthquake to hit other Steel-types like Arceus-Steel, Dusk Mane Necrozma, and I guess Magearna. Knock Off is also a decent option to snipe Lugia, Lunala, and Dawn Wings Necrozma and can have decent utility in general. This set is a really nice late-game cleaner, because setting up an SD is really easy on a lot of Pokemon, such as Arceus-Poison, Arceus-Fairy, etc. You can also force mindgames with people with Necrozma's typing changes, i.e you can choose to stay Psychic / Steel (which is a really good typing) or go to Psychic / Dragon and change your weaknesses/resistances. Photon Geyser is a really solid STAB move, but it only has 8 PP. Neuroforce is an okay ability, but you're probably OHKOing everything you hit with a +2 super effective move anyway, so it doesn't change that much, and the boost isn't significant. You can pair this up with Pokemon like Mega Rayquaza, which is a nice fit with any offensive Pokemon and can weaken mons like Arceus-Fairy, or Mega Gengar, which traps Lugia nicely and revenge kills other Pokemon. Ho-Oh can also be nice because it sponges attacks from Scarf Yveltal and Xerneas, which both look to revenge kill a boosted Necrozma. Ultra Bursting can also make you a bit more vulnerable to priority, because 1) you lose Prism Armor and 2) no more resistance to Extreme Speed.
There's also been talk about Ultra Necrozma with Dawn Wings (which I haven't actually tried yet because it's pretty underwhelming according to others), which works as a decent special sweeper with Calm Mind.
I'm guessing the set is something like this:
Necrozma-Dawn-Wings @ Ultranecrozium Z
Ability: Prism Armor
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Photon Geyser
- Moongeist Beam
- Earth Power
Necrozma's special movepool isn't all that great, so this is all I could come up with. Calm Mind is nice to set up against weak support Arceus formes (be wary of Toxic, though) or other Pokemon. Moongeist Beam doesn't hit that much but it does hit Lugia through Multiscale, which is really nice. Earth Power is good for Steel-types and SpDef Primal Groudon. You can be walled by Ho-Oh and Whirlwinded if you don't have your Z-Move anymore, so be careful of wasting it. Again you have the option for Rock Polish to not be revenge killed by Scarfers and Mega Gengar, but I think coverage is nicer with Dawn Wings. Unlike with Dusk Mane, Dawn Wings has a pretty bad defensive typing before Bursting in Psychic / Ghost, which doesn't grant many useful resistances and has 4x weakness to Shadow Sneak and Sucker Punch. Specially defensive Zygarde-C can also take a hit. Special walls are also a huge nuisance; Chansey blobs everything and sucks to go up against, Primal Kyogre doesn't really count as a special wall but has nice bulk and is really hard to OHKO outside of the Z-Move, Ho-Oh as mentioned before, specially defensive Celesteela can suck, etc. I think this thing won't have that much of an impact on the metagame, because it's pretty hard to justify when Dusk Mane is a lot better, and Dawn Wings might even be worse than Lunala thanks to no Shadow Shield.
I haven't tried Dusk Mane Necrozma without Ultra yet, but RNG's set above is ok and access to Stealth Rock is really cool. I won't talk much about it but I think it could be around A- to A rank. Dawn Wings Necrozma without Ultra just sounds like a worse Lunala, and Lunala isn't that great to begin with.
So yeah, those are my thoughts on the new Necrozma formes. I wanted to make a metagame post to showcase different move and set options and stuff, but I'll definitely try Ultra Dawn Wings Necrozma and regular Dusk Mane Necrozma soon. Have a good day! :}