Something occurred to me recently when brain storming ideas for a project. What exactly is Special Defense in Pokemon? Now I'm not questioning Sp Def as a game mechanic or think that it should be removed, but rather I'm fascinated by what it means from the perspective of the physical body. And I can't seem to think of what attribute of the body would constitute a "Special Defense". See in most other RPGs instead of Sp Def/ Sp Atk they have Magic Def/ Magic Atk and the standard Atk/ Def. Attack and Defense is simple as it represents the strength of a physical object like a punch, sword, arrow or any other solid object. And the defense from a thematic stand point is usually represented by armor or muscle mass. Magic Defense has several thematic explanations like the characters clothes or body is magic imbued or that they have a magic barrier or aura surrounding them or it can even be represented by spiritual power or protection from the gods or something. But for Special Defense I can't think of any thematic explanation for it. What exactly is a special defense? I mean if a Pokemon had gained tougher, I would imagine their ability to resist the pressure of water would also increase. We know for defense that would represent the Pokemon's armor, thick skin or muscles but for special defense I can't think of anything, it just sort of exists. Thoughts anyone? Disclaimer: I know I'm massively overthinking this but I found the question fascinating.