Rate my OU trick room team

Question

Bronzong @ Leftovers
Ability: Levitate
EVs: 4 Atk / 252 Def / 252 SpD
Relaxed Nature
IVs: 0 Spe
- Trick Room
- Gyro Ball
- Zen Headbutt
- Body Press

This is a secondary setter that can be reused or even used to fight if necessary.

Hatterene (F) @ Focus Sash
Ability: Magic Bounce
EVs: 252 HP / 252 SpA / 4 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe
- Trick Room
- Misty Explosion
- Mystical Fire
- Psychic

Sets trick room while also repelling hazards and generating momentum.

Melmetal @ Assault Vest
Ability: Iron Fist
EVs: 124 HP / 252 Atk / 124 SpD
Brave Nature
IVs: 0 Spe
- Double Iron Bash
- Body Press
- Thunder Punch
- Ice Punch

This menace is on all trick room teams. No explanation needed.

Crawdaunt @ Assault Vest
Ability: Adaptability
EVs: 252 HP / 252 Atk / 4 Def
Brave Nature
IVs: 0 SpA / 0 Spe
- Aqua Jet
- Crabhammer
- Close Combat
- Knock Off

This Pokémon is great at targeting fire types that normally cripple trick room teams and it can be used outside of trick room.

Slowking-Galar @ Assault Vest
Ability: Curious Medicine
EVs: 252 HP / 252 SpA / 4 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe
- Eerie Spell
- Flamethrower
- Ice Beam
- Sludge Wave

Curious medicine stops random stat boosting Pokémon and it can tank special hits really good in addition to nice coverage.

Clefable @ Life Orb
Ability: Magic Guard
EVs: 252 HP / 252 SpA / 4 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe
- Thunderbolt
- Moonblast
- Flamethrower
- Soft-Boiled

Decent special attacker

Comments

> No explanation needed.

Please explain a bit lol, why Vest as an item and why those move choices.

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Melmetal is best with Choice Band on a Trick Room team, the Assault Vest set lacks firepower. If you want to be able to switch up moves, the best option is something like Life Orb, but Choice Band is the best set. Superpower is better then Body Press since it benefits more from Choice Band and lets you score an OHKO on Ferrothorn and Heatran.

You generally want a suicide lead and two Trick Room setters so you can more reliably set up Trick Room. Use Cresselia instead of Bronzong.

As a general rule, you should use 252/4/252 unless you're trying to hit specific benchmarks. For a defensive Pokemon, invest in HP and a defense stat rather than in both stats.

Use Psyshock or Psychic instead of Eerie Spell on Slowking. Slowking also lacks firepower compared to other options for abusers, try something like Choice Specs or Life Orb, but you're probably better off with switching it and Clefable out for something else like Alolan Marowak or Conkeldurr.