I don't quite understand. Desukan has a chance to 3HKO Roopushin even if it is at Max HP and will always 3HKO with SR and 1 layer of Spikes....
"4 weaks and two counters"
If a Gen 4 stall team has Swampert, Skarmory, Heatran, Blissey, Scarf Rotom, Starmie [thats not necessarily a good stall...