Rate my Showdown Team, I was thinking to make some changes as I just entered the 1600's in National Dex AG

Question

Groudon-Primal @ Red Orb
Ability: Desolate Land
Shiny: Yes
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Fire Punch
- Precipice Blades
- Stone Edge
- Swords Dance

Ultron (Melmetal-Gmax) @ Lum Berry
Ability: Iron Fist
Shiny: Yes
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Double Iron Bash
- Thunder Punch
- Ice Punch
- High Horsepower

Kartana @ Focus Sash
Ability: Beast Boost
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Smart Strike
- Sacred Sword
- Defog

Marshadow @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Shadow Sneak
- Spectral Thief
- Bulk Up
- Drain Punch

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

Thanos (Kyogre) @ Choice Scarf
Ability: Drizzle
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Water Spout
- Origin Pulse
- Ice Beam
- Thunder

Comments

I don’t know much about National Dex but it seems like a good team, the only noticeable thing is the 3 steel types. Congratulations on getting into the 1600s!

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Don’t sash Kartana
Put scarf

Answer 1

• Get a counter to Groudon-P. Rayquaza-M would do, as would defensive Zygarde-C. Seeing as this is an offence team, you might use DD or Coil + Rest on Zygarde to limit its passivity.
• Use Choice Band on Melmetal to make it a proper wallbreaker. Otherwise, I find this Pokemon hard to justify on a team that already has the coverage it offers (and because it's slow and worsens your Groudon weakness).
• I think Kartana is outclassed by Rapid Spin Excadrill in this role. Excadrill has coverage for notable threats like Rayquaza, Yveltal and Lugia; and crucially, it can set up rocks which is important on offence teams.
• I'm not a huge fan of Bulk Up on Marshadow, given how fragile it is. Unless you're getting a good bank of HP back using Drain Punch (which is a bit wishful), the move is spent just for a +1 Attack boost. You can take or leave Max Guard.
• Fit Close Combat onto Marshadow's moveset for a high-power STAB move. You could also consider Endeavour, which lets Marshadow do something to its defensive checks.
• Consider swapping Marshadow with a sweeper Pokemon that overlaps less with Zacian's coverage. Something that can address Zacian's checks, especially Necrozma-DM and Quagsire stall, would be nice. Yveltal fits the bill -- it's a prime Dmax target and Zacian can pressure Chansey, Arceus, Xerneas, etc. for it.
• Use Close Combat on Zacian as well, instead of Sacred Sword. It is a stronger move and will get you important OHKOs. Don't mind the defence drops -- you probably shouldn't be attempting a sweep in the first place if your opponent still has a way to hit Zacian.