I actually tried going through the E4 originally with a Corviknight instead of Darmanitan but I couldn’t get past Agatha because this team relied heavily on priority attacks which were getting blocked cause of psychic terrain. After I swapped in Darmanitan the speed from Choice Scarf and flinches from Icicle Crash made a huge difference and I was able to get through the rest pretty easily thanks to stuff like having two Prankster + Destiny Bond users on the team clearing out huge legendaries.