Base stat of 65 Defense raises up to 98, Base stat of 120 Special Defense becomes 180
On paper it sounds good, but then you remember he has...40 HP. At full investment for HP, its only 284.
So, you could POSSIBLY run a 252 HP/252 Def/4 SpA set for results. The stats would be something like 284/126/229/237/276/216, and with the evolite, the defenses become 344 / 414.
It suffers "Knock Off syndrome", sneaky pebbles...just a lot