>>18684267Have you been under a rock or something? It's more OU than Skarmory now.
Main factor is the steel nerf. Skarmory has a harder time taking on strong physical Dark/Ghost attackers, so there was made a need for physically defensive dark type with recovery. Since Aegislash has fighting coverage, Umbreon couldn't fit the bill, and Mandibuzz is the ONLY other defensive dark type with recovery.
Steel Nerf also let its STAB Foul Play, one of the best tools for a physical wall, hit more stuff.
Defog also lets it get rid of hazards now. And Overcoat makes it immune to spore.
It always had the stats and movepool, the meta just didn't really have a need for it last gen.