^ When EVing defensively, you should almost always invest in HP first, with the exception of Pokémon with exceptional HP in the first place (I would go with 150+ for that). So, you have 252 HP EVs. Now, you will want to balance your defences out to be able to take hits from both sides of the attacking spectrum unless you want to EV to survive something in particular, which I feel is unnessecary outside of competitive in most cases. So, with a Bold nature, in order to equal out your Defences you will need 152 Def / 104 SpDef. Your final spread is
252 HP / 154 Def / 104 SpDef, with a Bold Nature. However, since you know Swagger, I would recommend you just use a Physical Wall set, i.e. 252 HP / 252 Def / 4 SpDef.