Weavile

Weavile's good Speed and Attack stats, combined with its incredible offensive typing, make it threatening to a lot of standard teams. Dark and Ice hit almost the entire tier for neutral damage, with only the rare Zamazenta-C and Magearna resisting both. Ice Shard can also be situationally useful in keeping opposing offensive setup sweepers in check, most notably Zekrom and Zygarde. Weavile has incredibly low bulk by Ubers standards, though, and can be incredibly difficult to bring in repeatedly as a result. Its Dark typing can make it difficult to fit onto teams because it cannot check Calyrex-S effectively, forcing stacking weaknesses to common Pokemon like Xerneas. It offers very little to teams defensively and can be difficult to justify over similarly fast offensive Pokemon like Marshadow and Mewtwo, which offer similar offensive pressure, but with more defined defensive niches. Weavile also has to rely on Triple Axel's unreliable accuracy for damage output, which is never ideal.