Hello! I think Sand teams are really cool, so I'd like to give you some suggestions about your team that can make it more successful!
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Scizor-Mega @ Scizorite
Ability: Technician
Tera Type: Water
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Roost
- Swords Dance
- Bullet Punch
- Sand Tomb
Into
Buzzwole @ Rocky Helmet
Ability: Beast Boost
Tera Type: Steel
EVs: 252 HP / 40 Atk / 104 Def / 112 Spe
Impish Nature
- Close Combat
- Ice Punch
- Thunder Punch
- Roost
I think that Mega Scizor on Sand is personally a waste of a Mega slot since you would always want to use Mega Tyranitar over it, so I suggest you use Buzzwole over it due to its stellar capabilities of walling Pokemon like Chien-Pao, Great Tusk, and Kingambit, while providing strong moves in Close Combat, and great coverage with Thunder Punch and Ice Punch. It also synergizes well with Tyranitar, as it provides a Ground, Fighting, and Grass type resist, along side Slowking for a Dark resist. The EVs let you outspeed Adamant Tyranitar, and Tera Steel gives it a Fairy and Psychic resist, while also giving it a Toxic immunity!
Tyranitar @ Leftovers
Ability: Sand Stream
Tera Type: Fairy
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Pursuit
- Stone Edge
- Stealth Rock
- Rest
Into
Tyranitar-Mega @ Tyranitarite
Ability: Sand Stream
Tera Type: Rock
EVs: 88 HP / 252 Atk / 168 Spe
Adamant Nature
- Stealth Rock
- Stone Edge
- Pursuit
- Crunch
Mega Tyranitar fits here due to how it is an very good offensive Pokemon to use on Sand, and is a good enabler to Pokemon like Excadrill (Which I have suggested later in this post), as well as tanking Special moves very well due to it's already massive natural bulk. Stealth Rock is Stealth Rock, and is very good paired when paired with a hard hitting Pursuit, pressuring Pokemon like Choice locked Tapu Lele and Gholdengo, Dragapult, while being able to provide good chip on a majority of Pokemon. You outspeed neutral base 60 Speed Pokemon with the EV spread.
Zapdos @ Heavy-Duty Boots
Ability: Static
Tera Type: Steel
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Defog
- Roost
- Discharge
- Hurricane
Into
Tornadus-Therian @ Heavy-Duty Boots
Ability: Regenerator
Tera Type: Ground / Steel
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
- Bleakwind Storm
- Heat Wave
- U-turn
- Defog
Tornadus-T is a superior Defogger over Zapdos here because of Regenerator, being able to easy recover any chip taken from Sand, as well as providing a Ground immunity, speed control, and momentum with U-turn, being able to bring it Pokemon like Buzzwole into Pokemon like Chien-Pao and opposing Tyranitar, or to bring in Excadrill on Pokemon like Tapu Koko and Magearna. Tera Ground can be used for an Electric immunity, while Tera Steel can be used for a Rock and Ice resist, as well as a Toxic immunity.
Hippowdon @ Leftovers
Ability: Sand Stream
Tera Type: Water
EVs: 252 HP / 4 Atk / 252 SpD
Careful Nature
- Slack Off
- Roar
- Toxic
- Earthquake
Into
Excadrill @ Normalium Z
Ability: Sand Rush
Tera Type: Ground
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Iron Head
- Giga Impact
Excadrill is a must on Sand, due to it having Sand Rush, nice hazard control in Rapid Spin, and being a stellar wallbreaker in general due to Swords Dance and providing a nice Ground type for Sand in general. Normalium Z hits Pokemon like Rotom-Wash, Zapdos, Slowbro, and can also do nice damage to Pokemon like Great Tusk with some chip.
Magearna-Original @ Leftovers
Ability: Soul-Heart
Tera Type: Ground
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 30 Atk
- Volt Switch
- Pain Split
- Ice Beam
- Spikes
Into
Tapu Koko @ Heavy-Duty Boots
Ability: Electric Surge
Tera Type: Grass
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunderbolt
- Grass Knot
- U-turn
- Roost
Magearna feels redundant here due to there being a Excadrill here, so I decided to slot a Tapu Koko, which gives you speed control, momentum, and fixes your Corviknight problem very easily. Grass Knot is to hit Pokemon like Great Tusk and Gastrodon, which can be boosted by Tera Grass, and gives it a Ground resist as well. You also have an improved match up against Rain, as Grass Knot Koko usually can do numbers against it, bar Ferrothorn, but you can always U-turn out.

Slowking @ Heavy-Duty Boots
Ability: Regenerator
Tera Type: Fairy
EVs: 252 HP / 4 Def / 252 SpD ->
252 HP / 76 Def / 180 SpD
Calm Nature
IVs: 0 Atk /
0 Spe
- Future Sight
- Teleport
- Scald
- Slack Off
Slowking fits really good on Sand as you mentioned, and makes a nice Regenerator core when paired with Tornadus-T, but I feel like investing some EVs into Defense may work, as you can still eat Tapu Lele's Moonblast twice from full with the spread, and 0 Speed IVs guarantee you will always pivot out last with Teleport. Tera Fairy gives you a Dark resist and a good U-turn resist as well, so there is no need to change that!
Overall, I like the idea of the team you are building, but with these changes, it can do way better than before. I may have changed a lot here, but I think some things had to be done in order to make your team successful. I hope this rate helped you out!
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