Asalamu alaykum friend asked why should we wish goodnes on government of Saudi if they do bad,i explained thats wrong, also i said Ahmad ibn Hanbal states "If I had one supplication that was guaranteed to be answered, I would make it for the ruler" But he doesn’t understand, can you explain to him

Making duʿā for the ruler, even when he does wrong, is the way of Ahl al-Sunnah, because, as Shaykh Ibn Uthaymin said, when the ruler is set right the people are set right. So we ask Allah to rectify him, not curse him. The saying you quoted is reported from Imam Ahmad and from al-Fudayl ibn ʿIyāḍ raḥimahumallāh.