A M-3 single sandstorm build that uses Tyranitar's Sand Stream as its core,削弱 physical attackers with Mega Scovillain and special attackers with Tyranitar, then allows the sandstorm aces (Excadrill and Houndstone) to sweep. Final rank: 470th.[Key Pokémon Points]Tyranitar: Smooth Rock Sand Stream. EVs: HP 32, Sp. Def 20, Speed 14. Moves: Stone Edge, Knock Off, Stealth Rock, Roar. The key is to use Roar + Stealth Rock to draw out and wear down special attackers when facing Hippowdon or Garchomp as a late switch-in.Houndstone: Spell Tag Sand Rush. EVs: HP 2, Attack 32, Defense 4, Speed 28. Moves: Poltergeist, Play Rough, Substitute, Sucker Punch. The true ace, faster than Choice Scarf Dondozo. Uses Substitute to block Hippowdon's Yawn and breaks through HB Hippowdon that Excadrill can't.Mega Scovillain: Scovillainite Insomnia. Moves: Leaf Storm, Flamethrower, Leech Seed, Protect. With HB, it can survive a max-roll 120-power move from a specially invested Mega Blaziken. Strong against Focus Sash and U-turn pivot Pokémon.Excadrill: Life Orb Sand Rush. Moves: Earthquake, Iron Head, Rock Blast, Swords Dance. Easy win against Mega Metagross if it doesn't get a chance to set up Iron Defense.Corviknight: Leftovers Pressure. Moves: Brave Bird, Bulk Up, Taunt, Roost. For denying Umbreon cycles and Staraptor.Mega RaichuY: RaichuniteY Lightning Rod. Moves: Zap Cannon, Focus Blast, Grass Knot, Volt Switch. Confirmed KO on Hippowdon with Grass Knot, checks Mega Charizard Y from above with Volt Switch.[Basic Lead and Strategy]Based on the premise that "all builds are divided into Hippowdon core / Garchomp core," Tyranitar is always led. If the opponent's ground type is Garchomp, Mega Scovillain + Tyranitar is central; if it's Hippowdon, Tyranitar + Houndstone is central.[Opponents to Watch Out For]Mega Charizard Y, Rotom-Wash, Corviknight, Hippowdon, Umbreon.