A:Answer Asus has an official one but I think it doesn't have anything special for this laptop so any 100watt compatible pd charger should do . I read online with older laptops you needed the Asus one to get full charging speeds but I don't think that's the case for this one.
Also, note that when charging via USBc you won't be able to run the discrete GPU at full speeds since it requires more power than 100watts. Also, when powered by USBc there will be more wear and tear on the battery since it charges the battery directly then provides power from there for the laptop to run. Whereas the power brick can directly run the laptop without going through the battery.