If you add the hp, defense and special defense of each restricted Pokemon, which one would have the highest?

Question

please don't question my curiosity.

Answer 1

I assume you're talking about Generation IX VGC.

Giratina-Altered (150/120/120) and Lugia (106/130/154) tie for first place with a combined 390 BST each.

List of Pokémon by stat combinations (Pokemon Database)