Hello. Your NU team seems fine. There are some things that will be changed to the team: some adjusting movesets and some replacing team members. Here's a quick list of the changes, which will be told more in depth:
Changes:
Arcanine: Changed to Tauros-Paldea-Aqua
Tsareena: Changed moveset
Florges: Adjusted moveset (can also be changed to Galarian Slowbro)
Staraptor: Changed to Flygon (set can be adjusted)
Duraludon: Changed to Registeel
Chandelure: Changed moveset
Arcanine -> Tauros-Paldea-Aqua
Changed Arcanine to Tauros-Paldea-Aqua since you have Chandelure as an offensive Fire-type on the team. Defensive Arcanine isn't really that good in NU. Aqua Pauros also has Intimidate just like Arcanine, and it fits well into the offensive core of Chandelure and Flygon. The set I'll provide is the Bulk Up set:
Tauros-Paldea-Aqua @ Leftovers
Ability: Intimidate
Tera Type: Steel
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Bulk Up
- Raging Bull
- Close Combat
- Aqua Jet
Tera Steel lets Aqua Pauros have an immunity to Toxic and resist Psychic and Fairy moves.
Tsareena
Tsareena @ Heavy-Duty Boots
Ability: Queenly Majesty
Tera Type: Dragon
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Power Whip
- Rapid Spin
- High Jump Kick / Triple Axel
- U-turn
On this team, the Tsareena EV spread should be more offensive. Tsareena uses Heavy-Duty Boots so it doesn't get harmed by entry hazards since it serves as the team's form of hazard removal. Power Whip is used instead of Trop Kick since this set is faster, and Trop Kick is used on physically defensive sets. I like the idea of High Jump Kick since it lets Tsareena deal super effective damage to Copperajah and Registeel, the two of them being Stealth Rock setters. Triple Axel can be used to hit Pokemon such as Vileplume, Flygon, opposing Tsareena, and Dragalge super effectively. The move for the third slot you should use depends on if you use Florges or Galarian Slowbro. If you use Florges, use Triple Axel. If you use Galarian Slowbro, use High Jump Kick. I chose Tera Dragon since it lets Tsareena have a decent defensive typing that lets it still resist Electric and Water moves.
Florges
Florges (Florges-Orange) @ Leftovers
Ability: Flower Veil
Tera Type: Ground
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Calm Mind
- Moonblast
- Tera Blast
- Synthesis
Made the Calm Mind set Physically Defensive to help it tank physical hits while serving as a wincon. Tera Ground with Tera Blast lets Florges hit Steel-, Fire-, and Poison-types such as Registeel, Copperajah, Chandelure, Arcanine, Qwilfish, Dragalge, Toxtricity, and Galarian Slowbro super effectively. Synthesis lets Florges have instant HP recovery. You can also make Florges a Galarian Slowbro for a better matchup against Vileplume:
Slowbro-Galar @ Rocky Helmet
Ability: Regenerator
Tera Type: Water
EVs: 252 HP / 208 Def / 48 Spe
Bold Nature
IVs: 0 Atk
- Nasty Plot
- Sludge Bomb
- Surf
- Slack Off
Surf with Tera Water is useful to beat checks such as Chandelure, Specially Defensive Mudsdale, Gligar, and Golurk. 48 Speed EVs allow Galarian Slowbro to outspeed Pokemon such as Copperajah and Mudsdale.
Staraptor -> Flygon
Flygon @ Choice Scarf
Ability: Levitate
Tera Type: Ground
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Outrage
- Dragon Claw
- U-turn
Changed Staraptor to Flygon so the team can have an Electric immunity. I have Choice Scarf on Flygon for speed control since I changed the Chandelure set. Outrage is used with Dragon Claw since Flygon may need to revenge kill a Pokemon using a Dragon STAB without having to stay in for 2-3 turns. Tera Ground boosts the power of Earthquake. You can also do Tera Steel to deal with opposing Flygon.
Duraludon -> Registeel
Registeel @ Leftovers
Ability: Clear Body
Tera Type: Dragon
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Stealth Rock
- Heavy Slam
- Earthquake
- Thunder Wave
Since the Duraludon you had was a Specially Defensive set, I replaced it with Registeel since it has really good special bulk that Duraludon lacks. Earthquake is used over Body Press to prevent Chandelure from coming in for free. Tera Dragon lets Registeel resist Fire moves and provides a nice defensive typing. Tera Water can also work so you can resist Fire moves and not have a weakness to Ice moves.
Chandelure
Chandelure @ Choice Specs
Ability: Flash Fire
Tera Type: Fire
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Overheat
- Flamethrower
- Shadow Ball
- Energy Ball
Changed to Specs since the set you have is what Specs Chandelure uses.
Revised teams can be found here:
Team with Galarian Slowbro
Team with Florges
Note: The offensive core of Tauros-Paldea-Aqua, Flygon, and Chandelure can mix and match their sets. Aqua Pauros can use Bulk Up, Band, or Scarf. Flygon can use Scarf, Dragon Dance, or Band. Chandelure can use Specs, Scarf, or Calm Mind. Let me know if you want me to send a Pokepaste containing the different team possibilities using the different sets the offensive core can use.
That's all of the changes. Hope these changes help, and good luck laddering! :)