Physically defensive spinblock?
252 HP/252 Def
Bold / No Guard
Dynamicpunch
Earthquake
Toxic/Rest
Shadow Punch/Stone Edge/Toxic
Rest is a good option since as a defensive spinblock you could run a special wall with Heal Bell. He has good 3-move coverage no matter what he picks, and toxic is always useful.
Somehow I can't shake the feeling that this is probably better with Iron Fist and Hammer Arm.
While No Guard does allow you to never miss, it also causes attacks vs you to never miss.
While if you pick Iron Fist, both Hammer Arm and Shadow Punch are getting a boost, which you could use since you're not running attack EVs.
Of course, the confusion on Dynamicpunch could off set all of these things.. I still think it's something worth considering on this set.
Bulbapedia says Hammer Arm is a punch move, however, I know many consider it inaccurate.. But meh, someone will correct me if they are wrong.