Scarf Nidoking has the ability to 2HKO/OHKO every member of your team with the correct move bar and Hitmontop; the former can easily be taken care of by pretty much any physically offensive fighting type, while the latter only avoids the 2HKO if it lacks Sludge Wave, but only slightly, as Earth Power has an 87.5% chance to 2HKO. Kingdra can't switch in more than once, so I suggest Porygon2 over Snorlax. The set would be:
252 HP, 4 Def, 252 SpAtk
This is still a great special tank, and can easily wall many special attackers. Plus, it brings some special offense to your team, which is nice. Hope I helped, and feel free to tweak/reject/accept P2.
Bearkiller on PS and IRC. May also go by the name of Grima on IRC. I play League of Legends, so there's that. Also free Genesect plz. My LP.