Conner:

Salazzle @ Poisonium Z
Ability: Corrosion
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Sludge Wave
- Flamethrower
- Hidden Power [Grass]

Cofagrigus @ Leftovers
Ability: Mummy
EVs: 252 HP / 4 Atk / 252 Def
Relaxed Nature
- Toxic Spikes
- Knock Off
- Shadow Ball
- Pain Split

Tyranitar-Mega @ Tyranitarite
Ability: Sand Stream
EVs: 168 HP / 252 Atk / 88 Spe
Adamant Nature
- Dragon Dance
- Pursuit
- Stone Edge
- Fire Punch

Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 Atk / 88 SpA / 168 Spe
Hasty Nature
- Stealth Rock
- Earthquake
- Hidden Power [Ice]
- U-turn

Kyurem-Black @ Choice Scarf
Ability: Teravolt
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Ice Beam
- Earth Power
- Fusion Bolt
- Dragon Claw

Starmie @ Life Orb
Ability: Analytic
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Psyshock
- Rapid Spin

Salazzle has hp grass for gastro, swampert. Sludge wave and fire blast as stab. Once a nasty plot is up it can take care of magearna easy.
Cofa is the tspikes setter which helps weaken down the opponents walls and I made it phys defense so it can take hits from lead lando and such
I chose tyranitar mega because I never used it before but it's a good mon lowkey especially after a plus one dd. Did take it from the samples but only because why fix something that wasn't broken. It outspeeds mega mawile with the 88 speed EVs.
Lando is the Rock setter of the group and the main lead Mon. I have 168 speed EVs to outspeed max speed timid heatran by one point.
Kyurem is a basic scarfer and with terravolt it helps get behind mimikyus disguise.
Starmie is my only hazard removal which is eh but with tspikes up as well as rocks I'm sure my opponent will try to click defog as I have cofa to be immune to rapid spin. Starmies max speed is 361 so it outspeeds a lot in the ou tier mainly non scarfed latis. With analytic even if your opponent switches it gets a boost so it's a basic mind game if your opponent switches.