This mon shits on screens single handedly but tbh I dont want to be running Skeledirge on every team just to not lose to screens + friends. Outside of dumping on these screen offense teams I think this mon kind of shit into everything else as well.
I've been using Skeledirge on the team that broke me into 1500+ for the first time in OU and Skeledirge isn't "kind of shit into everything else": Skeledirge also deals with Sneasler and Zamazenta quite well barring Dire Claw hax, Tera Flying Acrobatics on the switch, and offensive Zamazenta getting the switch-in predict right:
252 Atk Sneasler Gunk Shot vs. 248 HP / 0 Def Skeledirge: 98-116 (23.8 - 28.2%) -- 93.3% chance to 4HKO
252 Atk Sneasler Shadow Claw vs. 248 HP / 0 Def Skeledirge: 154-182 (37.4 - 44.2%) -- guaranteed 3HKO
252 Atk Tera Flying Sneasler Acrobatics (110 BP) vs. 248 HP / 0 Def Skeledirge: 180-213 (43.7 - 51.8%) -- 11.3% chance to 2HKO
0 Atk Zamazenta-Crowned Crunch vs. 248 HP / 0 Def Skeledirge: 136-160 (33 - 38.9%) -- 99.5% chance to 3HKO
252 Atk Zamazenta Crunch vs. 248 HP / 0 Def Skeledirge: 166-196 (40.3 - 47.6%) -- guaranteed 3HKO
252 Atk Zamazenta Stone Edge vs. 248 HP / 0 Def Skeledirge: 206-244 (50.1 - 59.3%) -- guaranteed 2HKO
252 Atk Choice Band Zamazenta Crunch vs. 248 HP / 0 Def Skeledirge: 248-292 (60.3 - 71%) -- guaranteed 2HKO
Skeledirge also forces Enamorus into using Choice Specs or Expert Belt and getting the predict right, and it doesn't do too badly into Iron Valiant:
252 SpA Enamorus Moonblast vs. 248 HP / 252+ SpD Skeledirge: 69-81 (16.7 - 19.7%) -- guaranteed 6HKO
252 SpA Enamorus Earth Power vs. 248 HP / 252+ SpD Skeledirge: 176-208 (42.8 - 50.6%) -- 1.2% chance to 2HKO
252 SpA Expert Belt Enamorus Earth Power vs. 248 HP / 252+ SpD Skeledirge: 211-250 (51.3 - 60.8%) -- guaranteed 2HKO
252 SpA Choice Specs Enamorus Earth Power vs. 248 HP / 252+ SpD Skeledirge: 262-310 (63.7 - 75.4%) -- guaranteed 2HKO
252 SpA Choice Specs Tera Fairy Iron Valiant Moonblast vs. 248 HP / 252+ SpD Skeledirge: 127-150 (30.9 - 36.4%) -- 64.9% chance to 3HKO
252 Atk Iron Valiant Knock Off (97.5 BP) vs. 248 HP / 0 Def Skeledirge: 212-250 (51.5 - 60.8%) -- guaranteed 2HKO
252 Atk Iron Valiant Knock Off vs. 248 HP / 0 Def Skeledirge: 144-170 (35 - 41.3%) -- guaranteed 3HKO
252 Atk Choice Band Iron Valiant Knock Off (97.5 BP) vs. 248 HP / 0 Def Skeledirge: 316-374 (76.8 - 90.9%) -- guaranteed 2HKO
252 SpA Iron Valiant Shadow Ball vs. 248 HP / 252+ SpD Skeledirge: 144-170 (35 - 41.3%) -- guaranteed 3HKO
252 SpA Choice Specs Iron Valiant Shadow Ball vs. 248 HP / 252+ SpD Skeledirge: 214-254 (52 - 61.8%) -- guaranteed 2HKO
The legends of Skeledirge forcing the Tera from Volcarona are also true:
252 SpA Volcarona Flamethrower vs. 248 HP / 252+ SpD Skeledirge: 66-78 (16 - 18.9%) -- possible 6HKO
252 SpA Tera Ground Volcarona Tera Blast vs. 248 HP / 252+ SpD Skeledirge: 234-276 (56.9 - 67.1%) -- guaranteed 2HKO
8 SpA Skeledirge Torch Song vs. 0 HP / 4 SpD Volcarona: 91-108 (29.2 - 34.7%) -- 6.3% chance to 3HKO
+1 8 SpA Skeledirge Torch Song vs. 248 HP / 0 SpD Volcarona: 135-160 (36.1 - 42.8%) -- guaranteed 3HKO
+2 8 SpA Skeledirge Torch Song vs. 248 HP / 0 SpD Volcarona: 180-213 (48.2 - 57.1%) -- 91.4% chance to 2HKO
In terms of generic special walling, Skeledirge does fine and can deal with Nasty Plot Tornadus-T for you and doesn't do too badly into Thundurus-T, either:
252 SpA Tornadus-Therian Hurricane vs. 248 HP / 252+ SpD Skeledirge: 138-163 (33.5 - 39.6%) -- guaranteed 3HKO
252 SpA Tornadus-Therian Dark Pulse vs. 248 HP / 252+ SpD Skeledirge: 136-160 (33 - 38.9%) -- 99.5% chance to 3HKO
252 SpA Thundurus-Therian Thunder vs. 248 HP / 252+ SpD Skeledirge: 169-199 (41.1 - 48.4%) -- guaranteed 3HKO
252 SpA Thundurus-Therian Dark Pulse vs. 248 HP / 252+ SpD Skeledirge: 164-194 (39.9 - 47.2%) -- guaranteed 3HKO
If half or more of the opposing team is made of physical attackers and they don't have Heatran in the back, Will-O-Wisp is a pretty free click and I have been willing to use that move on Magearna just to pump Hex and scorch away Leftovers. (Ceruledge needs to run Shadow Claw just for Fire and Fighting resists like Skeledirge, Slowking, and Azumarill, so it's not as scary a Flash Fire mon.)
Skeledirge feels like a more predictable defensive Gholdengo that, however, makes progress more easily during the one turn my opponent spends switching a better answer into the defensive Ghost. Their resist profiles are fairly similar, with the biggest differences being that Skeledirge resists Fire, while Gholdengo is neutral to Water, resists Rock, and is immune to Poison. Skeledirge even manages to have better special bulk than Gholdengo. U-turn always puts a wrench into both their plans of making progress, but every defensive wall shares the pivot move problem.
(And, while I personally think of Tera as a forbidden fruit that flips around checks and sometimes counters too often for me to support it staying in OU, and Tera Preview will not solve this because the true pain of dealing with Tera is in the teambuilder since mons like Tera Water Garganacl and Tera Fairy Garganacl behave like different defensive Pokemon entirely, Tera Fairy Skeledirge suddenly deals with Chien-Pao much better.)