Is a ritual bath (ghusl) obligatory if semen is discharged without pleasure after remembering Allah, while it is discharged with pleasure when not remembering Him?

One must perform ghusl (definition) (ritual bath) upon waking if semen is found after a wet dream, regardless of whether one felt pleasure or not. A wet dream might be from Satan or for another reason, and the remembrances (dhikr) recited before sleep have no bearing on its occurrence or non-occurrence. If wet dreams recur, one can consult doctors to understand their causes and treatment, along with supplicating and asking Allah for well-being.