Rate my Gen 8 NU team

Question

Abomasnow @ Light Clay
ABILITY: Snow Warning
NATURE: Modest (+SpAtk -Atk)
EVs: 252 SpAtk / 252 HP / 4 SpDef

Blizzard
Giga Drain
Earth Power
Aurora Veil

Aerodactyl @ Focus Sash
ABILITY: Unnerve
NATURE: Adamant (+Atk -SpAtk)
EVs: 252 Atk / 252 Spd / 4 HP

Stone Edge
Earthquake
Dragon Dance
Roost

Comfey @ Leftovers
ABILITY: Triage
NATURE: Timid (+Spd -Atk)
EVs: 252 SpAtk / 252 Spd / 4 HP

Draining Kiss
Giga Drain
Aromatherapy
Synthesis

Heliolisk @ Throat Spray
ABILITY: Dry Skin
NATURE: Timid (+Spd -Atk)
EVs: 252 SpAtk / 252 Spd / 4 HP

Thunderbolt
Volt Switch
Hyper Voice
Surf

Vaporeon @ Leftovers
ABILITY: Water Absorb
NATURE: Bold (+Def -Atk)
EVs: 252 Def / 252 SpDef / 4 SpAtk

Scald
Protect
Wish
Toxic

Arcanine @ Leftovers
ABILITY: Intimidate
NATURE: Jolly (+Spd -SpAtk)
EVs: 252 Atk / 252 Spd / 4 HP

Flare Blitz
Extreme Speed
Will-O-Wisp
Morning Sun

Comments

This team looks really good. However, I have a few suggestions regarding your Aerodactyl.  Because Aerodactyl is a fast pokemon and you put max speed EVs on it, it doesn't really need any speed boosts. A better move to use than dragon dance would be hone claws because it raises the attack and accuracy, and the accuracy boost will make stone edge, the stab move, hit every time. Also, roost is not vey good on a frail pokemon like Aerodactyl so I would swap it with a flying type move like dual wingbeat to get some good stab damage. Dual wingbeat is only 90 percent accurate but with the accuracy boost it will do work. If you can set up on your opponent with hone claws, you will be able to clap the opposing Pokémon especially with Dynamax and setting up sandstorm/boosting speed.

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I'm afraid your going to have to replace Aurora Veil on Abomasmow with another move. As of right now, Aurora Veil is banned from Gen 8 NU.

Answer 1

I've played Gen 8 NU before, so I might as well give this a go:

Abomasmow
Why Abomasmow? Abomasmow was a good Aurora Veil setter, but as of now, Aurora Veil is banned from Gen 8 NU. I'd actually replace Abomasmow with Celebi. Celebi has tons of options you could use. Here are a few Celebi sets that you can choose from:

Celebi @ Heavy-Duty Boots
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psychic
- Giga Drain
- Stealth Rock
- U-turn

Celebi @ Life Orb
Ability: Natural Cure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psychic
- Giga Drain
- Dazzling Gleam
- Nasty Plot

Celebi @ Life Orb
Ability: Natural Cure
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Zen Headbutt
- Leaf Blade
- Swords Dance
- Recover

Aerodactyl
The set looks fine, but I would replace Roost with Dual Wingbeat and Focus Sash with Heavy Duty Boots. Basically, the Aerodactyl set would be:

Aerodactyl @ Heavy-Duty Boots
Ability: Pressure
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Stone Edge
- Dual Wingbeat
- Dragon Dance

Comfey
Set seems fine. But I personally use this set:

Comfey @ Life Orb
Ability: Triage
EVs: 236 HP / 252 SpA / 20 Spe
Modest Nature
IVs: 0 Atk
- Draining Kiss
- Giga Drain
- Calm Mind
- Stored Power

Whether you use this set or not is completely up to you.

Heliolisk
The set is good, but I would use Toxtricity if your looking for a good Throat Spray Pokémon. Toxtricity's Ability, Punk Rock, boosts the power of its sound moves. While it has a base speed of 75, it has access to Shift Gear. Here is a Toxtricity set:

Toxtricity @ Throat Spray
Ability: Punk Rock
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Boomburst
- Overdrive
- Sludge Wave
- Shift Gear

Vaporeon
Set is good, but I would replace Vaporeon with Milotic. While Vaporeon has a higher HP stat, Milotic's Ability Marvel Scale doubles its defense stat when afflicted with a status condition. Here is a Milotic set:

Milotic @ Flame Orb
Ability: Marvel Scale
EVs: 252 HP / 208 SpD / 48 Spe
Calm Nature
IVs: 0 Atk
- Toxic
- Scald
- Ice Beam
- Recover

Arcanine
Change Leftovers to Heavy Duty Boots. Other than that, the set looks fine.
Basically:

Arcanine @ Heavy-Duty Boots
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Flare Blitz
- Extreme Speed
- Will-O-Wisp
- Morning Sun

Revisions can be found here as well:
https://pokepast.es/40092a06aaa83128

Hope this helps.