First and foremost, congratulations to the Slate 1 winners.
With that said, ugh, I had wanted to do a more nuanced approach to this, but due to all of the time wasted by so much BS today, I'll have to make this "short", meaning it will probably end up coming off far more naysaying than I originally intended since it seems easier to focus on stuff that
shouldn't get one of the new moves or abilities or, at least to me, stuff I'm weary of having such things. Apologies in advance:
The Winning Moves:
1.
Reconstruct: I'm a bit wary of giving this to
Aggron-Mega given Filter, even though it takes two turns and hilariously thus can get
shut down mid-charge by Taunt like Geomancy can, which I had to check this morning to be sure while dealing with...annoyances. For the record, I don't think it will be broken with it, but it and
Registeel might just end up super obnoxious stallers with it and Toxic. Not much else to say about it except that lesser Steels like
Klinklang and
Bronzong seem more than safe for this to have; none of the Steel mons already in OU should get it though "obviously", though Corviknight and Scizor already get better recovery anyway.
2.
Arid Absorption: Quite a few (weaker) things can have this and probably have it be fine despite it chunking Waters for Stealth Rock damage. Despite it fitting, however, neither Hippo nor T-tar should be among them, though I don't think anyone will argue against that. Personally I'm also a bit wary of
Steelix-Mega and
Gigalith having access to this, though it's more because it seems like would be obnoxious on them than broken. It's probably fine in Gigalith's case though, especially since if it's using Light Power than it's not using Sand Stream, but Steelix-Mega could go either way despite its crappy ability (and probably having access to Reconstruct anyway).
3.
Focus Blast: I can easily see this needing to be removed from some things now that it's basically 100% accurate with prediction or -Speed builds. That will take testing to confirm though, like pretty much everything I'm wary of.
4.
Meltdown: Pretty sure that despite being one of the examples,
Regice probably
shouldn't get this since becoming a pure Water type that (specially) bulky with access to 120 BP move post-STAB seems, uh, annoying to deal with. That said, like everything I'm expressing my caution on, I'd be willing to help test it first before throwing it under the bus. Other would-be users all seem fine from a glance though.
5.
Toxic Thread: Similarly not sure that
Slowbro-Galar should get this between its bulk and Regenerator being a super stupid ability (still) in addition to ViZar's Heavy-Duty Boots nerf not being among the winners. Other would-be users all seem fine from a glance.
The Winning Abilities:
6.
Light Power: As weird as it is to say, while I'm seemingly naysaying everything in sight right now, I might as well say that I think
Malamar of all things probably has too much SpA to safely have this--weird, I know. I'm just going off of how the strongest non-Mega Huge Power | Pure Power user is regular Medicham at 060 Atk. As utterly crappy as Malamar's typing is, easily one of the worst types in the game, Dark is rather spammable, its Speed isn't terrible either, and while Chansey and Blissey exist, it gets STAB Psyshock..which is now doubled in power. In addition to all that, a Special equivalent to Intimidate or Burn doesn't exist (and arguably shouldn't). Still, I'd be willing to test it out before condemning/denying it, but...yeah.
As for other users that could safely have Light Power with it fitting their flavor, everyone's favorite Doubles meme
Pachirisu seems the best stand out since there's weirdly not a Electric type among the examples; sorry, Pikachu, but you made your Light Ball bed, so die in it. Other potentially non-broken candidates to me are
Golem-Alola's line,
Marowak-Alola, and
maybe 
Carbink (which may be too bulky, but would finally have a niche over Diancie).
7.
Rain Dish | Ice Body: Everything that already has this outside of
Regice (again) seems fine. Regice getting this
and Meltdown though seems, uh, not good for fun gameplay unless you really,
really like Stall.
Miscellanous Naysaying since I'm such an Optimist:
8.
Angry at Birds: I'm actually glad that earl's
Articuno-Galar submission won since that mon might actually be worth a damn now even if Freezing Glare is still trash unfortunately. It's the other two I'm worried about, especially since nothing happened to Regenerator or Boots and since Magmortar II, Earl of Neutralizing Gas, doesn't exactly switch in that well against Moltres-Galar. We'll see though.
9.
Boomerang: We might have to lower the power on this eventually since that seems a better compromise than making it subject to Knock Off, but otherwise I'm glad it won since it's one of the items I was very close to voting for.
That's "all". Look forward to Slate 2.
(Pokemon who should NOT get this move:
)
,
,
,
(all sizes)
Note: final distrib could be smaller than these, these are just suggestions
+ assorted other Psychics and Fairies
)
+ other regis?
, Ice types dealing with biting.
, maybe other monkes
can make use of it; NOT
!)
Grim Neigh / Cursed Body
As One / Cursed Body
Morning Sun
Morning Sun, Spikes
Moonlight
Morning Sun
Moonlight
Moonlight
, Suicide leads, Very frail mons
/
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
(lol Reckless) and 
(lol High Jump Kick and Unburden).
