SS OU New to competitive, want some tips n pointers on my team

[Nooberj]

So here's my team. Any and all advice is welcome and appreciated. Thanks in advance!

Hydreigon
Timid nature, life orb
Draco meteor
Dark pulse
Flash Cannon
Fire blast

Galar Darmanitan
Jolly nature, choice scarf
Icicle crash
Flare blitz
Earthquake
U-turn

Rotom Wash
Timid, aguav berry
Volt switch
Hydro pump
Thunder wave
Protect

Sylveon
Modest, choice specs
Hyper voice
Psyshock
Mystical Fire
Shadow ball

Toxapex
Bold, black sludge
Scald
Sludge bomb
Toxic
Recover

Excadrill
Jolly, focus sash
Stealth rocks
Rapid spin
Earthquake
Iron head

 

[Rio Vidal]

Hi, welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide at least 3 lines of descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.