Amoonguss is the tier's sole defensive user of Spore, as it can stick around and put foes to sleep throughout a match. Giga Drain affords Amoonguss extra longevity, which is particularly helpful because Regenerator often cannot keep up with the damage that Amoonguss takes. However, Grass Knot hits foes like Dondozo, Garganacl, and Ting-Lu harder. Clear Smog removes the boosts of setup sweepers like Dragonite, Dragon Dance Dragapult, and Bulk Up Great Tusk. Foul Play, on the other hand, gives Amoonguss a way to pressure Dragapult immediately while still punishing physical setup sweepers. Red Card phazes setup sweepers like Iron Valiant and Walking Wake. Alternatively, Rocky Helmet lets Amoonguss punish U-turn users like Meowscarada and Scizor, while Covert Cloak is a valid option to check Garganacl more easily. Tera Water Amoonguss checks Cinderace, while Tera Fire Amoonguss can use Clear Smog safely on Tera Fire Breloom at the cost of becoming weak to Ground-types like Great Tusk. Maximum HP investment with 84 Special Defense EVs prevents a 2HKO from Choice Specs Dragapult's Shadow Ball; the rest of the investment is poured in Defense to better check Great Tusk.

Amoonguss is best utilized on balance teams that appreciate it taking a foe out of commission with Spore. Gholdengo and Dragapult greatly appreciate this as well as Amoonguss's ability to check Ting-Lu. Cinderace and Kingambit are other good offensive teammates that appreciate Amoonguss threatening Dondozo. Because Amoonguss relies mostly on Regenerator for its recovery, entry hazard removal in the form of Great Tusk or Iron Treads is key; Great Tusk also checks Cinderace, while Iron Treads can help deal with Gholdengo. Even though Amoonguss has the ability to check some setup sweepers with Clear Smog, it is best to pair it with an Unaware teammate like Skeledirge or Dondozo, which can handle Pokemon like Tera Flying Roaring Moon much more effectively. Pokemon like Dragonite and Choice Band Roaring Moon also make for good partners, as Amoonguss is one of the best Iron Valiant checks.