When equipped with a Life Orb or Spell Tag, Marshadow is great at cleaning up weakened teams. Spectral Thief is used over Poltergeist for its consistent power, accuracy, and utility against set-up sweepers such as Calm Mind Kyogre, while Low Kick is chosen over Close Combat as the majority of the Ubers tier is very heavy. Shadow Sneak makes Marshadow a useful revenge killer and prevents Calyrex-S from threatening it. The last moveslot is customizable based on team need. Ice Punch is a strong option for hitting Zygarde, which can otherwise wall Marshadow or use it as a setup opportunity, as well as easing prediction against Yveltal and Eternatus. Notably, Life Orb Jolly sets have a chance to 2HKO Eternatus with Ice Punch. Rock Tomb OHKOes Ho-Oh and heavily damages Yveltal; the Speed drop also helps Adamant Marshadow outspeed checks like Eternatus. Bulk Up is Marshadow's only good boosting move, and it works best in tandem with Spell Tag. Marshadow's longevity is significantly improved without Life Orb recoil, letting it survive attacks from Eternatus, Necrozma-DM, and Yveltal and potentially power through them. Life Orb is usually preferred on sets with four attacks, but Spell Tag is still a valid option for longevity. Note that Ho-Oh needs to be chipped before Spell Tag Marshadow can OHKO it. Jolly nature can be used especially for outspeeding Eternatus, but the power drop is definitely notable. Adamant works best when paired with paralysis support.

This set requires strong wallbreakers as teammates. Kyogre can notably put pressure on Eternatus, Hone Claws Yveltal can lure in Eternatus and Buzzwole, and Dragon Dance Necrozma-DM has great synergy, as it can take out Ho-Oh and Yveltal with Stone Edge and set up on Xerneas and Eternatus. Ferrothorn's Spikes can help Marshadow pressure its checks, such as giving Jolly Marshadow a greater chance to 2HKO Eternatus. Necrozma-DM is a highly recommended teammate to switch into Eternatus and Xerneas and set up Stealth Rock, helping Marshadow sweep much more easily. Eternatus and Zygarde provide synergy by switching into Ho-Oh and statusing the opposing team. Eternatus also forces out Buzzwole. Xerneas, Buzzwole, and Zarude can switch into Zygarde-C and force it out. Blissey can switch Marshadow in with Teleport, heal Life Orb recoil with Wish, and provide cleric support. Ho-Oh easily switches in on Xerneas and Buzzwole. Additionally, both Thunder Wave Kyogre and Ho-Oh can lure Eternatus and paralyze it, helping Adamant Marshadow take it out.

Choice Band's power allows Marshadow to be more flexible in the attacks it runs. For example, with Choice Band, Marshadow can run Spectral Thief with a Jolly nature and comfortably 2HKO the vast majority of Eternatus sets, not needing Poltergeist or Adamant to 2HKO. Shadow Sneak is a useful priority move to revenge kill threats, especially when boosted by Choice Band. In the last slot, Ice Punch or Rock Tomb is used to heavily damage checks such as Zygarde and Ho-Oh. Poltergeist is a useful in-between option, as it's Marshadow's strongest Ghost-type attack, and it hits both the aforementioned foes for good damage. However, Poltergeist has notable flaws in its accuracy and vulnerability to foes with consumed items. While an Adamant nature is possible, Jolly is greatly preferred for letting Marshadow outspeed and 2HKO Eternatus, a very common switch-in. Despite Choice Band's power, be careful when locking into a move, since Zygarde-C, Xerneas, Landorus-T, Necrozma-DM, Buzzwole, and Zarude can often set up for free against certain moves.

This set works well on teams that want a revenge killer that isn't Calyrex-S. Certain setup sweepers appreciate this set's focus on wallbreaking power. Zygarde-C and Kyogre enjoy Marshadow heavily pressuring Eternatus, Groudon appreciates it continuously bashing Zygarde-C with Ice Punch, and offensive Necrozma-DM loves it taking out Ho-Oh with Rock Tomb. Other setup sweepers that enjoy Marshadow removing Eternatus are Zarude and Buzzwole. Checks to Pokemon such as Groudon, Zygarde-C, and Zekrom are much appreciated teammates, such as Xerneas and Landorus-T, as those foes can all take a hit from Marshadow if need be. Pivots such as U-turn Yveltal and Teleport Blissey help Marshadow come into the game much more easily and check Calyrex-S, which can force Marshadow out if it is locked into a move besides Shadow Sneak. They appreciate Marshadow's ability to force out setup sweepers like Cosmic Power Eternatus and SubCM Kyogre, and U-turn Yveltal and Marshadow together can keep SubSeed Calyrex-S in check. Blissey is also good for cleric support, as are Xerneas and Clefable. If Marshadow runs Poltergeist, make sure none of its teammates have Knock Off on their sets.