Hey joey i got a team around eject button toxapex and scarf alolem to trap tran and other steels. The rest of the team is basically setup mons that can sweep once the bulky steels are gone
https://pokepast.es/cfa6b39560bd3bc6
https://pokepast.es/cfa6b39560bd3bc6
The Speed EVs on Drudd help you to outspeed and Taunt lead Diancie.
And the EV spread on Slowbro help you when it comes to Vanilluxe's Ice Cream:
252+ SpA Choice Specs Vanilluxe Freeze-Dry vs. 216 HP / 188 SpD Assault Vest Slowbro: 218-258 (56.6 - 67%) -- guaranteed 2HKO after hail damage
Last tip: Play very carefully vs Passimian and Medicham (specially Passimian).