Help optimizing/adding legendaries or paradox pokemons

So I've got this team I really Like and have been getting a lot of wins with, I've been playing like a day and I've got to great ball lol 8 with it but I've noticed how I keep losing to the legendaries probably because of the lack of legendaries in my tram because this team is from regulation h, and I'm pretty sure it's now regulation g because I see tons of legendaries.

The team in question:

Garchomp @ Clear Amulet
Ability: Sand Veil
Tera Type: Dragon
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Protect
- Earthquake
- Dragon Claw
- Swords Dance

Talonflame (F) @ Covert Cloak
Ability: Gale Wings
Tera Type: Fire
EVs: 184 HP / 68 Atk / 4 SpD / 252 Spe
Jolly Nature
- Brave Bird
- Tailwind
- Will-O-Wisp
- Flare Blitz

Tyranitar (M) @ Assault Vest
Ability: Sand Stream
Tera Type: Flying EVs: 156 HP / 252 Atk / 4 SpD / 96 Spe
Adamant Nature
- Rock Slide
- Assurance
- Stone Edge
- Low Kick

Gholdengo @ Choice Specs
Ability: Good as Gold
Tera Type: Steel
EVs: 188 HP / 216 Atk / 104 Spe
IVs: 0 Atk
- Make It Rain
- Shadow Ball
- Steel Beam
- Trick

Brambleghast (F) @ Focus Sash
Ability: Wind Rider
Tera Type: Grass
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Poltergeist
- Power Whip
- Shadow Sneak
- Strength Sap

Glimmora (F) @ Power Herb
Ability: Toxic Debris
Tera Type: Rock
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Meteor Beam
- Spiky Shield
- Earth Power
- Sludge Bomb

Brambleghast and glimmora are disposable because I mostly don't use them unless there's a kyogre or smth, and maybe tornados would be a better Tailwind setter?

I want to keep garchomp and tyranitar cuz I Like them, I mainly need counters for the meta big dmg stuff.

Another question, is there a way to take a team from pokemon showdown and use it as a rental team in scarlet/violet?

Thanks yall for reading this essay

Edit: tyranitar is Tera flying for garchomp to use earthquake