#1 Truant Durant w/ Entrainment and sash.
It just needs to get Truant onto the enemy lead Pokemon.
#2 Setup sweeper w/ protect
Switch in on truant turns, protect on non-truant turns and setup till max on following truant turns. Proceed to sweep once sufficiently boosted.
This a just one idea and this really helped me.If you want to see more options, this might help you
Hope I helped!