Good day, here are some teams used to beat the elite four.
https://pokepast.es/8c207d46fe076888
https://pokepast.es/c4cd94b1f63296c1
https://pokepast.es/377e2a4b0955cf6f
https://pokepast.es/8f3def7bb6413ceb
(excadrill team, this one was the popular right now, feel free to ask if you got questions about playing the team)