Houndstone/Staraptor Sand

Synergy

Sand Stream from Tyranitar keeps both Excadrill and Houndstone permanently ahead of the field while chipping the opposing side every turn, and Mega Staraptor's Tailwind plus Rotom-Wash's Volt Switch give the team a second layer of speed control for the games sand alone does not solve. Mega Venusaur's Sleep Powder buys the extra turns needed to let the two Sand Rush sweepers close things out once a Trick Room setter or slow answer has been put to sleep.

Win Conditions

Set Sand Stream turn one and lead Tyranitar plus Excadrill or Staraptor plus Excadrill to punish predicted switches with Rock Slide, then let Sand Rush Houndstone close the game with a boosted Last Respects once trades have been made, using Will-O-Wisp and Ally Switch to buy the extra turns it needs to get there.

Lead Options

Tyranitar + Excadrill, Staraptor + Excadrill, Rotom-Wash + Venusaur

Threats

Dark-types that threaten Houndstone before Staraptor's Intimidate can remove them, Basculegion if its Speed tier is underestimated, and Charizard Y or other sun-reliant teams that force Rotom-Wash and Mega Venusaur into a damage race instead of a clean sweep.