Marshadow @ Life Orb  
Ability: Technician  
EVs: 252 Atk / 4 Def / 252 Spe  
Naive / Jolly Nature  
- Spectral Thief  
- Storm Throw  
- Shadow Sneak  
- Hidden Power [Ice] / Rock Tomb
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Optional Move(s)
- Destiny Bond
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Marshadow @ Marshadium Z  
Ability: Technician  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Bulk Up  
- Spectral Thief  
- Storm Throw  
- Shadow Sneak / Substitute
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Marshadow is a good revenge killer thanks to its unresisted STAB combination combine with its great speed tier and an immunity to Extreme Speed. Its access to Technician-boosted coverage in Rock Tomb and Hidden Power Ice further helps its offensive capabilities in addition to a STAB Storm Throw, which its stronger than Close Combat thanks to a guaranteed hit and lack of Defense drop and Shadow Sneak to revenge kill faster threats. Despite its great offensive presence, Marshadow still struggles outright KOing many bulky pokemon such as Primal Groudon, Ho-oh and Mega-Salamence, which forces it out by taking a hit and retaliate with a strong attacks due to its middling bulk and leaves it reliant on chipped damage and coverage to beat them.