Garchomp sets up the front with Stealth Rock and Dragon Tail, while Volcarona and Serperior boost themselves with Quiver Dance and Leaf Storm respectively for a stacking sweeper build. Mimikyu and Mega Gyarados add physical-side power, and Mega Raichu handles Electric-type checking. Against Water-type walls, Raichu's and Serperior's special firepower stays effective.
Garchomp (Haban Berry, Rough Skin): Dragon Tail / Earthquake / Rock Tomb / Stealth Rock. A lead that sets Stealth Rock and drives the cycle with forced switches via Dragon Tail.
Volcarona (Sitrus Berry, Flame Body): Fiery Dance / Bug Buzz / Morning Sun / Quiver Dance. Quiver Dance raises both Sp. Atk and Speed, making it the team's centerpiece for a one-turn sweep.
Mimikyu (Life Orb, Disguise): Play Rough / Wood Hammer / Shadow Sneak / Swords Dance. Disguise absorbs the first hit for free while Swords Dance doubles its physical power as a breaker.
Mega Gyarados (Intimidate): Waterfall / Earthquake / Ice Fang / Dragon Dance. Intimidate first lowers the opponent's physical line, then Dragon Dance accelerates it into the closer.
Serperior (Focus Sash, Contrary): Leaf Storm / Dragon Pulse / Glare / Taunt. Contrary flips the Leaf Storm Sp. Atk drop into a boost, making it a second sweeper.
Mega Raichu (Lightning Rod): Zap Cannon / Focus Blast / Grass Knot / Trailblaze. Lightning Rod absorbs Electric moves and helps against Water walls, doubling as the team's final safety net.