Actually one stall team archetype I have been playing a lot starts with Forretress or Heatran for hazards control and to get a genesect "counter" out of the way. From there I pretty much have 4 pokemon to cover everything else. Surprisingly one limit when it comes to the physical side is Mamoswine, mamoswine has 2 counters that aren't worn down, Skarmory, and Slowbro. Since I have hazards slowbro seems like a good start, all I need then is a Scizor counter (maybe Tyranitar) so I am balancing between Jellicent and Gliscor. The special side is a bit more tricky, but Blissey and Amoonguss have been solid players, Amoonguss needs some testing over Celebi though. In either case I need something that can take volt switches, Breloom, and Keldeo, so its pretty much a toss up. I would not say sun stall is precisely bad, its more of extremely difficult to play and take a ton of playing with. I remember in BW1 a few got in the top 10 with sun stall teams, you know back when that was hard. One big pro of sun stall is the ability to use fucking cresselia can gain 75% health in one turn. Cresselia is like immortal if played correctly, her bulky makes things shat their pants. She is one of the few pure Mix-mence counters for example. Again it is very hard to play, regular stall is hard enough, but if your pure insanity, suns stall is very possible.