Need help sweeping

Looking for some advice. I need more offence. My 3 Pokemon I want to keep are Dragonite Sable and Steelix. I am currently also using Gengar and Salazzle and Toxapex. Gengar and Salazzle have been disappointing and I'm not sold on Toxapex either.

Mega Sable
Toxic
Will o wisp
Recover
Snarl/knock off

Steelix
Chesto berry
Gyro ball
Curse
Rest
Toxic/Stealth rock

Dragonite (Max hp) (Max special D)
Leftovers
Dragon Dance
Outrage
Roost
Earthquake

Toxapex
Black sludge
Baneful bunker
Liquidation
Toxic spikes
Recover

Salazzle
Focus sash/life orb
Venoshock
Fake out
Flamethrower
Nasty plot

Gengar
Focus sash/life orb/air balloon
Sludge bomb
Hex
Energy Ball
Dazzling Gleam

What tier is this team in? If this is OU, Dragonite faces stiff competition from Zygarde as a Dragon Dance sweeper because the former has a very spammable attack in Thousand Arrows. Salazzle is straight up outclassed by Volcarona because of the latter?s better coverage options and access to Quiver Dance. Steelix is also outclassed by Ferrothorn, Skarmory, and Celesteela as a defensive Steel type because the latter has a better set of resistances.

If you?re using Toxapex on an offensive team, you?re doing it wrong because it?s way too passive for that kind of team. It?s better in stall teams. However, Mega Sableye and Ferrothorn are good teammates for Toxapex, so that?s already a good start:

Sableye:
-Knock Off
-Will-o-Wisp
-Recover
-Protect
Nature: Careful
EVs: 248 HP/8 Def/252 SpD
Item: Sablenite
Ability: Prankster

Item removal is more useful than a Special Attack drop.

Toxapex:
-Scald
-Haze
-Toxic/Toxic Spikes
-Recover
Nature: Calm
EVs: 248 HP/8 Def/252 SpD
Item: Black Sludge
Ability: Regenerator

Scald has to be Toxapex?s offensive attack because of the potential to burn physical attackers.

Ferrothorn, Skarmory, or Celesteela should be your Steel of choice:

Ferrothorn:
-Stealth Rock/Spikes
-Leech Seed
-Power Whip
-Gyro Ball/Knock Off/Protect
Nature: Sassy
EVs: 252 HP/48 Def/208 SpD
Item: Leftovers
Ability: Iron Barbs

Celesteela:
-Heavy Slam
-Flamethrower
-Leech Seed
-Protect
Nature: Relaxed
EVs: 248 HP/104 Def/156 SpD
Item: Leftovers

Skarmory:
-Spikes/Stealth Rock
-Brave Bird/Counter
-Whirlwind
-Roost
Nature: Impish
EVs: 252 HP/252 Def/4 SpD
Item: Leftovers/Rocky Helmet
Ability: Sturdy

I?ll add in possible teammates another time.

If you want to sweep with Dragonite, how you have it set up right now is not terribly good for that role. A possibly better way would be something like:

Dragonite @ Flyium Z
Ability: Multiscale
EVs: 252 Atk / 252 Spe / 4 Def
Adamant/Jolly Nature
-Dragon Dance
-Fly
-Extreme Speed
-Earthquake/Fire Punch

You can also try to run it with Weakness Policy (or even a different Z Crystal) and swap Fly for some other attacking move--use both Fire Punch and Earthquake, slot in one of the other elemental punches, etc. Not Outrage though. Never really liked Outrage in a Fairy-infested meta.

The team also requires hazard control since you're using Dragonite. It really doesn't want to take damage when switching in so Multiscale is not broken, which it really needs intact to start setting up. Mega Sableye can help prevent hazards from being set, but you need more of a guarantee than that really. There's a number of things that can learn Defog or Rapid Spin, so take your pick from there.