is my uber team good?

Question

also should i replace marshadow with dragapult?

Eternatus @ Choice Scarf
Ability: Pressure
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dynamax Cannon
- Flamethrower
- Sludge Bomb
- Eternabeam

Dracovish @ Choice Scarf
Ability: Strong Jaw
EVs: 252 Atk / 4 SpD / 252 Spe
Brave Nature
- Fishious Rend
- Crunch
- Ice Fang
- Psychic Fangs

Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Behemoth Blade
- Swords Dance
- Sacred Sword
- Play Rough

Darmanitan-Galar @ Choice Band
Ability: Gorilla Tactics
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Icicle Crash
- Flare Blitz
- Earthquake
- Zen Headbutt

Marshadow @ Life Orb
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Shadow Sneak
- Spectral Thief
- Close Combat
- Iron Head

Ditto @ Choice Scarf
Ability: Imposter
EVs: 252 Atk / 252 Spe
Naive Nature
IVs: 30 Atk
- Transform

Answer 1

Way too many Choice items limit your options a lot. This makes you switch pokemon a lot more and you have no defensive pivot so switching into an enemy pokemon is always dangerous for you. But I understand that you want a super offensive team, the only thing I don't think is good is four of your pokemon being limited to one move per switch. Also, I'd rather have Modest instead of Timid on Eternatus since Choice Scarf is more than enough to have very high speed. Other than that, it's a very strong offensive team with great coverage. If you're thinking about switching Marshadow for Dragapult (which I don't think is necessary) make it a special attacker since most of your mons are physical.

Answer 2

Eternatus
This is pretty good but I would replace Eternabeam with either Flash Cannon or Shadow Ball or if you decide to remove the Scarf, then you could use recover.

Dracovish
Nothing to change except maybe removing Ice Fang with a Dragon move

Zacian-Crowned
Usually I would say to have Fire Fang for Corviknight but you have 2 Fire type attacks on very heavy attackers so it's fine to not do so.

Darmanitan-Galar
Pretty good so all that could be changed is maybe using Stone Edge instead of Zen Headbutt though you get nothing against fighting types if you do.

Marshadow
I wouldn't replace it with Dragapult because too many weaknesses would overlap on your team. Also the moveset is good but maybe you could use Ice Punch instead of Iron Head since there aren't too many fairy types except Zacian which takes neutral damage anyways. Also if you really wanna be that person, you could use a Focus Sash.

Ditto

The thing with Ditto is, it copies every stat except HP all you need is a full HP investment I think.

I hope I may have helped.