Attacker: Rillaboom @ Choice Band · Adamant · 252 ATK / 252 SPE · Grassy Surge
Defender: Gastrodon @ Leftovers · Sassy · 252 HP / 252 SPD · Storm Drain
Level 50, Gen 9 Doubles. Spread moves include the ×0.75 Doubles modifier. Standard max-investment reference sets — tweak EVs, items, spreads, and weather in the calculator.
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