Some of the strongest teams seem based on hazards stacking. The general strategy is to run:
Spikes (usually skarmory)
Steal Rock (sually tyranitar)
Spin Blocker (jellicent or bulky gengar)
Hazards abuser in either Alakazam or Reuniculus
Some way to not automatically die to sun
X - If you aren't using jellicent to spin block you need a rain counter.
One can also try to build the team without a spin blocker if they have multiple rocky helmets. For example Garchomp + Ferrothorn/Skarm.
An example build: *
Tyranitar (lead)
Heatran (scarf)
Reuniculus (bulky CM)
Gastrodon (defensive)
Gengar (bulky)
Skarmory
If you build these right they are ok vs Sun/Rain. However they can be a little soft to stall if running Zam. And a little soft to offense if runnign reuniculus. Though neither problem is terminal. There are really quite alot of ways of building these teams imo.
*I didn't build the example team.
