I made this this team from Marriland's Teambuilder, and I've tested it quite a bit, but it may need some improvement. If any water type pokemon are around against me, it's pretty much useless when Gastrodon's around. It feels like a pretty good team but rate away anyways.
Tyranitar(Lead)
_____________
@Lum Berry
Trait: Sand Stream
Evs:252HP / 64 SpA / 192Spe
Sassy Nature
~SuperPower
~Fire Blast
~Crunch
~Ice Beam
The most essential pokemon needed for a sandstorm team, I use it to send out the Sandstorm to either switch into another poke with the special defensive boost for my fellow ground and steel types. For T-tar the special defensive boost is great for surviving the most powerful special attacks, such as draco meteor. It's moveset give it a nice coverage, surviving a Genesect Bugbuzz and killing it with FireBlast. It is a good lure to water type attacks so I'll be able to switch into gastrodon. It is used for a Specially Defensive tank and to survive most hits. The lum berry is to cure those nasty status effects known as paralysis and sleep, so its able to continue its dusty rampage.
Gliscor(Bulky Sweeper)
___________________
@Toxic Orb
Trait:Poison Heal
Evs:252 HP / 64 Def / 192 Spe
Impish Nature
~Protect
~Earthquake
~Facade
~Swords Dance
This poke benefits from the sandstorm and can confuse opponents with this moveset. I'm able to set up if my foe assumes it's just another one of those stally gliscors. The Ev spread is to help it outspeed and at the same time take some physical hits for it to set-up swords dance. It helps to break walls that stop this team, such as ferrothorn,deoxys D,etc. A good scouter with the use of protect and to heal up with poison heal along the way.
Rotom-W(Bulky Special Attacker)
____________________________
@Life Orb
Trait:Levitate
Evs:184 Hp / 4 Def / 144 SpA / 176 SpD
Modest Nature
~Hydro Pump
~Will-O-Wisp
~Volt Switch
~Pain Split
The purpose of this poke is to cover up the weakness to fire type moves. Its role is to be a bulky special attacker and to cover up my team weaknesses and to provide some bulk. Willowisp further weakens physical threats like gyrarados,breloom and other pokes that counter this team. Provides a move to check the opposing team and spammable. This is the only poke that is able to switch into an ice type attack that might've been directed at gliscor.
Gastrodon(Bulky Support)
_____________________
@Leftovers
Trait: Storm Drain
Evs:252 Hp / 4 SpA / 252 SpD
Calm Nature
~Toxic
~Ice Beam
~Earth Power
~Recover
The purpose of this pokemon is to completely stop water type pokemon if switched into a water type move, so it has the chance to sweep if needed. That and also to gain immunity to water and electric type moves. With sandstorm up, its able to takes ALOT of special attacks that would otherwise cause massive amounts of damage to my other pokes. Since it's one my most valued pokemon in this team, is should stay in longer with recover and wear down pokes with toxic that gastrodon has a hard time dealing with.
Gallade(Specially Defensive Bulky Sweeper)
____________________________________
@Leftovers
Trait: Steadfast
Evs:240 Hp / 224 SpD / 44 Spe
Calm Nature
~Substitute
~Drain Punch
~Shadow Sneak
~Bulk Up
Designed to be a bulky physical sweeper to set up on walls if needed. It is used to provide type coverage and overall more bulk. Bulk makes up for his low Def and to power up his moves to wreck face. It has drain punch to stay in as long as possible enough to deal as much damage as possible. Shadow sneak is used to surprise psychic types.
Skamory(Physical Wall)
___________________
@Shed Shell
Trait: Sturdy
Evs:252 Hp / 232 Def / 24 Spe
Impish Nature
~Whirlwind
~Brave Bird
~Spikes
~Roost
Still THE best wall with its typing today, and gets the special def boost from t-tar as a bonus. With 2 of my pokemon are weak to grass its really mandatory to have a very solid counter to them, such as my skarm. Is able to wall physical attacks that cannot deal with skarmory and setup on the opponent with spikes. It is also to able phaze out baton passers,sword dancers,subs,etc. WIth roost, it can stall out pokemon that are deemed threatening to my team.
Now please keep in mind this is my first team where I actually put some thought into creating and don't worry, I've tested this team on battle sims, just needd some tweaking for an efficient team be it replacing a poke, changing ev spread, items,etc. Any criticism is greatly appreciated.

Tyranitar(Lead)
_____________
@Lum Berry
Trait: Sand Stream
Evs:252HP / 64 SpA / 192Spe
Sassy Nature
~SuperPower
~Fire Blast
~Crunch
~Ice Beam
The most essential pokemon needed for a sandstorm team, I use it to send out the Sandstorm to either switch into another poke with the special defensive boost for my fellow ground and steel types. For T-tar the special defensive boost is great for surviving the most powerful special attacks, such as draco meteor. It's moveset give it a nice coverage, surviving a Genesect Bugbuzz and killing it with FireBlast. It is a good lure to water type attacks so I'll be able to switch into gastrodon. It is used for a Specially Defensive tank and to survive most hits. The lum berry is to cure those nasty status effects known as paralysis and sleep, so its able to continue its dusty rampage.

Gliscor(Bulky Sweeper)
___________________
@Toxic Orb
Trait:Poison Heal
Evs:252 HP / 64 Def / 192 Spe
Impish Nature
~Protect
~Earthquake
~Facade
~Swords Dance
This poke benefits from the sandstorm and can confuse opponents with this moveset. I'm able to set up if my foe assumes it's just another one of those stally gliscors. The Ev spread is to help it outspeed and at the same time take some physical hits for it to set-up swords dance. It helps to break walls that stop this team, such as ferrothorn,deoxys D,etc. A good scouter with the use of protect and to heal up with poison heal along the way.

Rotom-W(Bulky Special Attacker)
____________________________
@Life Orb
Trait:Levitate
Evs:184 Hp / 4 Def / 144 SpA / 176 SpD
Modest Nature
~Hydro Pump
~Will-O-Wisp
~Volt Switch
~Pain Split
The purpose of this poke is to cover up the weakness to fire type moves. Its role is to be a bulky special attacker and to cover up my team weaknesses and to provide some bulk. Willowisp further weakens physical threats like gyrarados,breloom and other pokes that counter this team. Provides a move to check the opposing team and spammable. This is the only poke that is able to switch into an ice type attack that might've been directed at gliscor.
Gastrodon(Bulky Support)
_____________________
@Leftovers
Trait: Storm Drain
Evs:252 Hp / 4 SpA / 252 SpD
Calm Nature
~Toxic
~Ice Beam
~Earth Power
~Recover
The purpose of this pokemon is to completely stop water type pokemon if switched into a water type move, so it has the chance to sweep if needed. That and also to gain immunity to water and electric type moves. With sandstorm up, its able to takes ALOT of special attacks that would otherwise cause massive amounts of damage to my other pokes. Since it's one my most valued pokemon in this team, is should stay in longer with recover and wear down pokes with toxic that gastrodon has a hard time dealing with.

Gallade(Specially Defensive Bulky Sweeper)
____________________________________
@Leftovers
Trait: Steadfast
Evs:240 Hp / 224 SpD / 44 Spe
Calm Nature
~Substitute
~Drain Punch
~Shadow Sneak
~Bulk Up
Designed to be a bulky physical sweeper to set up on walls if needed. It is used to provide type coverage and overall more bulk. Bulk makes up for his low Def and to power up his moves to wreck face. It has drain punch to stay in as long as possible enough to deal as much damage as possible. Shadow sneak is used to surprise psychic types.

Skamory(Physical Wall)
___________________
@Shed Shell
Trait: Sturdy
Evs:252 Hp / 232 Def / 24 Spe
Impish Nature
~Whirlwind
~Brave Bird
~Spikes
~Roost
Still THE best wall with its typing today, and gets the special def boost from t-tar as a bonus. With 2 of my pokemon are weak to grass its really mandatory to have a very solid counter to them, such as my skarm. Is able to wall physical attacks that cannot deal with skarmory and setup on the opponent with spikes. It is also to able phaze out baton passers,sword dancers,subs,etc. WIth roost, it can stall out pokemon that are deemed threatening to my team.

Now please keep in mind this is my first team where I actually put some thought into creating and don't worry, I've tested this team on battle sims, just needd some tweaking for an efficient team be it replacing a poke, changing ev spread, items,etc. Any criticism is greatly appreciated.