>>31566092Just a couple calcs for comparison. Used Hariyama because base 120 ATK.
252+ Atk Choice Band Hariyama Knock Off (97.5 BP) vs. 252 HP / 252+ Def Blissey: 298-351 (41.7 - 49.1%) -- guaranteed 3HKO after Leftovers recovery
252+ Atk Choice Band Hariyama Knock Off vs. 248 HP / 252+ Def Shuckle: 43-51 (17.6 - 20.9%) -- possible 5HKO
So between Blissey & Shuckle we have the two opposite ends of the spectrum. Let's compare to something in between.
252+ Atk Choice Band Hariyama Knock Off vs. 252 HP / 252+ Def Manaphy: 79-94 (19.5 - 23.2%) -- possible 5HKO
As you can see, when fully invested on that defensive side of the spectrum Blissey's defenses (255/10) are basically half that of something with (fully invested) 100/100 defenses.