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Actual answer, its Hidden Ability in Unaware and a solid defensive stat spread and signature move that boosts Sp Att compliments its nature as a tank that gets stronger over the course of a battle, while denying the opposition's set up
These things, coupled with a solid typing, access to immediate healing in Slack Off, the ability to sleep foes with Yawn/Sing(don't laugh, I've seen cheeky Throat Spray procs using this as a way to boost and possibly shut down a switch-in all at once), and just enough move coverage to be dangerous makes Skeledirge a very solid mon