Why Hp Grass over Energyball?
You know what an awesome 3rd gen Cradily ms is?
Cradily @ Leftovers
Max HP, sdef and def whatever
Rest
Barrier
Mirror Coat
Toxic
Barrier is bait for Ice Beamers. They die to MC. Toxic for other damage and Rest for stalling. You might think it sucks, but just try it.