The new DLC has provided us with some pretty ridiculous new toys.

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Giving Mamoswine Triple Axel would be insane enough, but Technician boosted Triple Axel is just stupidly powerful. Having essentially 180 BP from just Technician, STAB, Bulk Up, and coming off a 130 base Atk, and then considering that Mamoswine has STAB Earthquake as well to deal with the non-levitating Fire, Steel, Water, and Ice types, you won't be walling Mamoswine easily.
Also inheriting from Hitmontop gives you access to Rapid Spin, Mach Punch, Bullet Punch, and Sucker Punch for some control over your speed.
Mamoswine @ Wide Lens
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Triple Axel
- Bulk Up
- Earthquake
- Rapid Spin
Since Hitmontop lacks Hone Claws, Wide Lens will have to do in order to have a decently reliable Triple Axel (giving a 1.331x boost effectively, which is miles better than the 1.1x boost you get. Making Triple Axel 97.0299% accurate as opposed to 72.9% without Wide Lens).

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/ Mostly anything with Iron Defense+Body Press+something unique
Among all legal Fighting types, Cobalion has the most Def and a pretty good speed tier to boot. Kommo-o previously held the record for having the single strongest Body Press in the game (being even stronger than if Stakataka had Body Press), so now Cobalion has an even stronger Body Press, a better defensive typing, and far better speed as well.
A number of Pokemon give Iron Defense+Body Press, so here is a short list of notable donors;
Corviknight (Roost+Pressure+U-turn), Ferrothorn (Leech Seed and Spikes/Rocks), Kommo-o (Abilities), Magnezone (Magnet Pull+Volt Switch), Mew (Heal Bell+several other moves), Slowbro (Teleport+Regenerator+Slack Off), Obstagoon (Guts, while it doesn't boost Body Press (to my knowledge), it nullifies burns, and Parting Shot), Claydol/Bronzong (Levitate), Coalossal (Flash Fire), Mudsdale (Stamina), Appletun (Ripen/Gluttony+Recover/Recycle+Leech Seed), any of the Shell Armor users, and Dubwool (Cotton Guard instead of ID and Fluffy/Bullet Proof).
Surprisingly diverse amount of options.

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While Dragapult does not inherit the ability to use Thick Club, it sure does appreciate Marowak's and Dhelmise's movepool, namely Poltergeist.
Being the second best Ghost type move in the game, it would be no surprise that one of the best Ghost types getting access to. Not only that, but also Sword Dance as well.
Marowak-A provides Outrage, Lighting Rod (for Thunder Wave), Rock Head Flare Blitz, and Bonemerang, Dhelmise provides Steelworker Anchor Shot, and Rapid Spin (because it wasn't fast enough), and both give Dragapult Sword Dance.
Dragapult @ Life Orb
Ability: Steelworker
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Poltergeist
- Swords Dance
- Anchor Shot
- Rapid Spin
Dragapult @ Life Orb
Ability: Lightning Rod
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Poltergeist
- Outrage
- Bonemerang

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This is pretty obvious if you were aware of the new Terrain related moves, giving the Galar Terrain setters new moves that are boosted (or in Grassy Glide's case, given priority).
Rising Voltage is the strongest of these moves after Terrain Boost+Double Power. Having an effective 182 BP under Electric Terrain. Zeraora is fast and hits extremely hard. Magnezone and Vikavolt have the highest SpA among Electric types, and Toxtricity gets STAB on Venoshock, since honestly Pincurchin has a terrible movepool so you'll be using T-Spikes a lot.
Alakazam is the fastest (legal) Psychic type and the Second strongest (legal) Psychic type. Given Alakazam's frail nature, Psychic Terrain is pretty good in general for Alakazam, although giving it Psychic Surge in the meta will remove its access to Nasty Plot. Regardless, having an psuedo immunity to priority and a 156 effective STAB from a 135 SpA is nothing to ignore.
Dhelmise.
You know how Yveltal has the strongest priority move in the entire series with Sucker Punch boosted by Dark Aura, and having 131 Atk?
252+ Atk Choice Band Dhelmise Grassy Glide vs. 252 HP / 252+ Def Slowbro in Grassy Terrain: 332-392 (84.2 - 99.4%) -- guaranteed 2HKO after Grassy Terrain recovery
252+ Atk Choice Band Dark Aura Yveltal Sucker Punch vs. 252 HP / 252+ Def Slowbro: 338-402 (85.7 - 102%) -- 12.5% chance to OHKO
Yeah. Dhelmise has the second strongest priority move (technically speaking in the game already, but it now gets Grassy Surge from Rillaboom so it doesn't have to rely on a Rillaboom teammate).
And it has Sword Dance, Acrobatics, Wood Hammer, High Horsepower, U-Turn, Knock Off, Fake Out, and Leech Seed to, when Inheriting from Rillaboom.
And also an immunity to Normal and Fighting moves too.
Could you imagine Kartana in this Meta with Rillaboom as a donor? For now, Dhelmise will be a terror as a base form and a donor too.