^Parasect is indeed amazing. So long as he doesn't go down in one hit, he'll be around to stall for turns to come.
To be honest, finding room for a spin blocker is tough. Starmie will take advantage of your rain and blast your spin blockers apart with LO rain boosted hyrdro pump. Jellicient, I've tried and usually didn't like. Spiritomb can handle starmie with a careful switch.
While not a spin blocker, rugged helmet Nattorei deserves a mention. You can make up for the lack of leftovers with wish passing. Spinners do not like losing 1/4th of their health just for spinning against you, and aside from hitmontop and torkoal (I've seen one), most spinners have issues against Nattorei anyway. You can set up against the pathetic resisted rapid spin as much as you please.
There's also heal bell Lanturn. I'd mention submersion if a few more pokemon learned it. Although it takes two moveslots and two turns, being able to toxic steel and poison type pokemon can be useful at times.
To be honest, finding room for a spin blocker is tough. Starmie will take advantage of your rain and blast your spin blockers apart with LO rain boosted hyrdro pump. Jellicient, I've tried and usually didn't like. Spiritomb can handle starmie with a careful switch.
While not a spin blocker, rugged helmet Nattorei deserves a mention. You can make up for the lack of leftovers with wish passing. Spinners do not like losing 1/4th of their health just for spinning against you, and aside from hitmontop and torkoal (I've seen one), most spinners have issues against Nattorei anyway. You can set up against the pathetic resisted rapid spin as much as you please.
There's also heal bell Lanturn. I'd mention submersion if a few more pokemon learned it. Although it takes two moveslots and two turns, being able to toxic steel and poison type pokemon can be useful at times.