Psyshock is Flutter Mane's best option against Clodsire and Eternatus. Alternatively, Mystical Fire can be used, being Flutter Mane's best option against Pokemon like Zacian-C and being boosted under sun. Power Gem is extremely valuable coverage, allowing it to OHKO offensive and defensive Ho-Oh after a bit of chip. Tera Fairy boosts Moonblast, allowing Flutter Mane to hit damage thresholds like 2HKOing Calm Mind Kyogre and Ting-Lu after a slight amount of chip while giving it a useful resistance to Dark-type attacks like Chien-Pao and Kingambit's Sucker Punch, although it removes its immunity to Extreme Speed. Tera Stellar is an option, giving Flutter Mane a one-time boost to any of its attacks, allowing it to outright OHKO any Ho-Oh variant while still retaining its valuable immunity to Extreme Speed. However, it is worthless after Flutter Mane uses a move, as that move will then not be boosted for the rest of the game.

When using Flutter Mane, Koraidon is a near-obligatory partner; Koraidon sets up sun, which enables Protosynthesis, as well as pivoting Flutter Mane into Pokemon it can beat like Landorus-T, opposing Koraidon, and Necrozma-DM. Other pivots like Miraidon and Landorus-T give Flutter Mane a safe opportunity to come into the field and wallbreak safely. Offensive Pokemon like Extreme Killer Arceus, Deoxys-A, and Kyogre all appreciate Flutter Mane wearing down their checks like Necrozma-DM and Miraidon. Physical attackers like Zacian-C, Groudon, and Ho-Oh make it difficult for Flutter Mane to come in safely and wallbreak; Pokemon that can take on these threats like one's own Ho-Oh, Necrozma-DM, and Arceus-Water all make good partners. Spikes support from Clodsire and Ting-Lu can give Flutter Mane extra support and chip Arceus into the range of Tera Fairy-boosted Moonblast. Flutter Mane has a terrible matchup against Sticky Web teams, as it has terrible bulk and is forced to gain a Special Attack boost from Protosynthesis when affected by Sticky Web, so partners like Extreme Killer Arceus and Calyrex-I can ease the matchup. Flutter Mane covers the Fairy-type teamslot on teams, giving them flexibility with picking an Arceus forme and Tera types.

This set takes advantage of Flutter Mane's great strength and coverage to become a fearsome wallbreaker. Power Gem lets Flutter Mane destroy Ho-Oh, an otherwise perfect counter to Flutter Mane, but has very little practical use otherwise. Calm Mind lets Flutter Mane reliably break through defensive Arceus formes like Arceus-Ground and Arceus-Fairy for the benefit of teammates like Koraidon and Miraidon. Psyshock hits Clodsire and Eternatus, while Mystical Fire hits Zacian-C, but both have little practical use beyond hitting their intended targets. Tera Fairy is the preferred Tera type with Calm Mind. Tera Stellar is preferred when not running Calm Mind, as Flutter Mane's coverage moves can struggle to OHKO their intended targets. For example, Ho-Oh and Zacian-C can normally survive Power Gem and Mystical Fire, respectively, from full HP. However, with Tera Stellar, Flutter Mane's coverage moves are favored to OHKO these Pokemon. Tera Stellar is also useful for boosting Moonblast's power while keeping Flutter Mane's immunity to Extreme Speed from Extreme Killer Arceus, allowing Flutter Mane to pick it off from higher HP.

Choice Scarf Koraidon is Flutter Mane's best friend, as Koraidon provides Flutter Mane with sun and pivot support. Koraidon also appreciates Flutter Mane threatening Koraidon's checks for it, like Landorus-T and Ho-Oh. Another good partner is Miraidon, which can work with Flutter Mane to overwhelm shared checks such as Arceus-Ground and Arceus-Fairy. Spikes support from Gliscor and Ting-Lu are generally good for wallbreakers like Flutter Mane, but Flutter Mane in particular enjoys Spikes weakening its checks, as it's not easy to revenge kill courtesy of its impressive Speed and good defensive typing. Thus, Spikes allows Flutter Mane to continue being threatening even against fast-paced offensive teams, especially as its low bulk makes it somewhat difficult to safely get on the field; it can also be forced out by Pokemon like Zacian-C if not carrying Mystical Fire. Entry hazard control in the form of Giratina-O's Defog is also an option to increase Flutter Mane's longevity, as otherwise Flutter Mane gets worn down very quickly by entry hazards and Life Orb recoil.