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As far as black and white nuzlocks go I didn't have a problem with N or gheist. Only pokemon I lost was My big black dragon and I didn't really care because I just had got him. Srafty can pretty much OHK everything in game other then the fighting E4 member.
I fought a team just like this this morning and won. This seems to be an all out offence team but you may want to consider adding a more defensive pokemon in there to try and wall the other might ubers.
My thoughts exactly. Also the Sucker punch makes them think your running a different set so you can go ahead and call a switch in to something that sets up.
Sucker punch and toxic could be switched to Taunt and thunder wave with would break speed ties and stop set up as well.
It is for...
Im sorry I posted this before reading the whole thing. I still think rapid spin is in general a good move on him that is a good option on almost any set.
This is the set I'm running on pokemon online and it is working rather well.
I'm running immunity because it's surprising how many toxic switch in's you get onto snorlax trying to deal with it setting up curses.