So I wrote the Genosect analysis a few days back...it's worth checking out if you dig this guy as much as I do!
http://www.smogon.com/forums/showthread.php?t=80135
The Rock Polish set is my favorite at the moment. I'm not a big fan of set-up sweepers generally speaking...I steered away from them in DP for the mostpart and will probably do the same in BW but Rock Polish Genosect doesn't have any of the problems that put me off other set-uppers. Those being:
- Difficulty setting up
- Vulnerability to priority
- Vulnerability to Scarfers.
Genosect has 9 resistances and an immunity so you'll always have opportunities to grab your boost. He resists Bullet Punch, Extremespeed, Ice Shard, Sucker Punch, Fake Out...you name it. And I realise that we play in a game where priority has become so powerful that even a resist doesn't neccesarily save you but even the mighty CB Scizor is averaging a paltry 31%. As for Scarfers, the spread I listed in the analysis outruns + Spe Choice Scarf Darkrai/Weavile/Swellow and you still have the option to pump it up even higher to beat the likes of Timid Scarf Mewtwo/Shaymin-S (probably worth doing if they're in the same metagame once things settle down). You can even go Timid to outrun Jolly Sand Throw Doryuuzu. Put simply; this thing is a real mother to revenge kill.
Now lets talk about the power. THE POWER. Check out these sample calcs (all assume Modest nature, a Download boost and Life Orb)
Bug Buzz vs 252/0 Swampert = 80% - 95% (8% chance to OHKO after Stealth Rock)
Bug Buzz vs 4/0 Garchomp = 94% - 111% (guaranteed OHKO after Stealth Rock)
Thunderbolt vs 252/0 Suicune = 92% - 108% (guaranteed OHKO after Stealth Rock)
Bug Buzz vs 252/0 Tyranitar in SS = 98% - 116% (guaranteed OHKO after Stealth Rock)
Thunderbolt vs 4/0 Shanderaa = 87% - 103% (guaranteed OHKO after Stealth Rock)
That is some freakish power especially considering he can hit like that off the bat. Most Pokemon would be pleased to hit that hard after a Nasty Plot but Genosect does it without wasting a turn. Great stuff!
As for the coverage, Bug Buzz/Flamethrower/Thunderbolt is the way to go. HP Water or Ground is a waste because Thunderbolt already OHKO's every common Fire type with the exception of Heatran who still loses 70ish%. Ice Beam only really helps against Zapdos and Dragonite (The other Dragons and Gliscor are OHKO'd by the relevant attack). Techno Buster is a joke.
edit: Forgot to mention that this guy is a death sentence for heavy offense teams. Show me a heavy offense team and I'll show you a team that Genosect has very little difficulty dismantling.