Monotype Help me with my monotype ground team

[DarkLordDarkraiYT]

This is my team so far:
Hippowdon (M) @ Groundium Z
Ability: Sand Force
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Earthquake
- Ice Fang
- Sandstorm
- Stone Edge

Garchomp (M) @ Garchompite
Ability: Sand Veil
EVs: 4 HP / 252 Atk / 252 Spe
Naive Nature
- Earthquake
- Dragon Claw
- Poison Jab
- Fire Blast

Excadrill (M) @ Assault Vest
Ability: Sand Rush
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Earthquake
- Rock Slide
- Iron Head
- Shadow Claw

Gastrodon (M) @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Recover
- Toxic
- Earthquake
- Scald

Nidoking (M) @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Flamethrower
- Thunderbolt
- Earth Power
- Ice Beam

Landorus @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Gravity
- Earth Power
- Focus Blast
- Sludge Wave

Is there anything I can do to improve my team

 

[maroon]

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.

Here are some Monotype resources in the meantime-
Sample Teams: https://www.smogon.com/forums/threads/monotype-sample-teams.3599682/#post-7292576
Viability Rankings: https://www.smogon.com/forums/threads/monotype-usm-viability-rankings.3622349/