Edit: Seeing that mostly SleepPowder and Spore are used, did anyone have success with SapSipper Pokemon?
Sap Sipper Goodra is good, and that was even before the Sleep Clause-less ladder. With an Assualt Vest and its great special bulk, it is excellent against sun teams due to strong match-ups against most Fire-types and Grass-types. It is probably the best individual Pokemon answer to the Mega Zard + Venasaur combo (though don't just rely on Goodra for this), and it also fairs well against other common Pokemon like Rotom-W and Latios - Timid Latios' Specs Draco Meteor never OHKOs, whilst Goodra's unboosted Draco Meteor will always OHKO.