Sand
Tyranitar Sand Stream + Excadrill Sand Rush. Special Defense buff to Rock-types pads survival.
The build
Sand chip damage + Excadrill's Sand Rush speed + Tyranitar's special bulk in Sand makes this a durable mid-tier archetype. Mega Tyranitar amplifies the Rock-type 1.5x SpDef boost. Garchomp + Hippowdon Sand Force is a side variant.
Signature Pokémon
Tyranitar 
Excadrill 
Hippowdon 
Garchomp Lead options
Tyranitar + Excadrill is the standard. Hippowdon + Garchomp for the bulkier variant.
Win condition
Sand up + Excadrill outspeeds the field with Sand Rush. Earthquake spread + Iron Head finishes.
Hard counters
Rain (Pelipper) overwrites your weather. Grass types resist EQ. Sun (Charizard) flips matchup.
Signature moves
Sample team
Plug-and-play 6-Pokémon roster you can import to the team builder. Adjust EVs / nature / move slots based on your specific local meta and tournament reg.
Incineroar 
Whimsicott 
Kingambit