Marshadow

Thanks to its unresisted STAB combination, strong attacks, and good Speed, Marshadow is one of the best wallbreakers and sweepers in Ubers. It can pressure common defensive Pokemon such as Eternatus and Yveltal regardless of its set. Even checks to Marshadow, such as Ho-Oh and Zygarde, have to be extremely wary of Marshadow's coverage options. Additionally, Technician-boosted Shadow Sneak easily dispatches Calyrex-S and does good damage to many Speed-boosting threats such Necrozma-DM, while Spectral Thief can halt other setup sweepers such as Coil Zygarde, Calm Mind Kyogre, and Cosmic Power Eternatus. These moves allow Marshadow to be an effective revenge killer; only Choice Scarf Calyrex-S can compare to Marshadow's utility in this regard. Marshadow's major flaw is that it is frail and has to rely on pivots and smart double switches to come into battle.