Golurk has had an interesting history. While its Ghost Ground type is horrible, being weak to many common types (Dark, Ice, Water, Grass), it also has many important defensive traits. Being immune to 3 types (Normal, Fighting and Electric) is a great start, and having a valuable resistance for Rock and Bug moves means that Golurk can actually blank a good number of Pokémon. Most Electric types lack the coverage to deal with Ground types and a good number of Fighting types usually only have EdgeQuake for coverage, which means Golurk can have use. However with the buff to Knock Off, especially in the generational shift were everything is vulnerable to it (no Z-Crystals/Megastones to blank it), in addition to the wider distrubution of moves like Darkest Lariat, means that most Fighting types have a reliable answer to Golurk now and every team is carrying an answer to Golurk.
Generation 8 has not been all bad to Golurk. Poltergeist is the physical STAB Ghost types have been begging for for years, and Close Combat is a welcome new coverage option over Dynamic Punch which requires No Guard. Heat Crash and Heavy Slam provide strong Fire and Steel options. Golurk has its problems, but its role compression and attributes give it a niche that few others can match.
Emet
Golurk
Ability: Iron Fist
Item: Colbur Berry
-Poltergeist
-Earthquake
-Close Combat
-Stealth Rock/Ice Punch
EVs: 252 HP / 252 ATK /4 DEF
Nature: Adamant (+ATK, -SATK)
This set is meant to have Golurk excel in the early game, coming in on a Fighting or Electric type and smacking it around with its STABs or setting up Stealth Rock. And if your opponent switches to a Dark type or something with Knock Off as coverage? Laugh as the Colbur Berry ruins Knock Off and counter attack with Close Combat. Stealth Rock enables Golurk to have a lasting presence even after it is knocked out, while Ice Punch provides excellent coverage.
252 Atk Krookodile Knock Off (97.5 BP) vs. 0 HP / 0 Def Colbur Berry Golurk: 178-210 (55.7 - 65.8%) -- guaranteed 2HKO
252 Atk Choice Band Drapion Knock Off (97.5 BP) vs. 0 HP / 0 Def Colbur Berry Golurk: 222-262 (69.5 - 82.1%) -- guaranteed 2HKO
252+ Atk Guts Obstagoon Knock Off (97.5 BP) vs. 0 HP / 0 Def Colbur Berry Golurk: 244-288 (76.4 - 90.2%) -- guaranteed 2HKO