That thing looks like it is made to be sturdy, but still balanced. So, here is what I propose ...
115 HP / 80 Attack / 95 Defense / 110 Sp.Atk / 70 Sp.Def / 75 Speed
BST = 545 Total
Very sturdy, easily able to take a lot of hits with 115 / 90 / 70 Defenses. That's some serious defense right there, man. A very viable physical wall, even, if that is how you want to play your game. Meanwhile, it has a high enough attack statistic to use the physical side, while it still has a threatening 110 Sp.Atk to coincide with what we decided. That design looks fairly medium speed, so 75 Speed should be fine, and let's it still out-run a lot of the lower-tiered speed racers. And, yet, it's still very balanced. If you treat it like a physical wall, that's what you'll get, and you won't have much offense from your 110 Sp.Atk, much like how Hippowdon doesn't have much attack even though it has a high attack statistic due to how we treat it.