Mega Beedrill / Mega Swampert Rain

Synergy

Pelipper's Drizzle powers both Archaludon's Electro Shot and Mega Swampert's Swift Swim sweep, while Incineroar and Farigiraf pivot and stall long enough for the mega attackers to break through. Farigiraf's Armor Tail also shields the fragile Mega Beedrill from priority, and its Rain Dance lets Archaludon fire off Electro Shot even under Trick Room without needing Pelipper on the field.

Win Conditions

Rain boosted Wave Crash from Mega Swampert under Swift Swim speed, or a snowballing Archaludon that has stacked Stamina Defense boosts and hits with a plus one Electro Shot. Mega Beedrill's fast U-turn also cancels opposing weather setters and keeps repositioning for late game sweeps once support Pokemon have worn down the rest of the team.

Lead Options

Pelipper alone into no-weather leads, Beedrill + Archaludon, Swampert + Incineroar, Farigiraf + Archaludon, Incineroar + Archaludon, Beedrill + Swampert

Threats

Opposing weather setters like Mega Charizard, Mega Frostlass, or Sand Stream force weather wars that can strand the team without rain. Priority users such as King Gambit's Sucker Punch threaten Mega Beedrill outside of Farigiraf's Armor Tail range, and status moves like Sleep Powder from Venusaur or Whimsicott stall out the offense.