The Status Effects info on the Combat Bookshelf in the Non-Hidden Regalle Royal Library says Earth Resistance helps Stone Wall.
Also, should the second half of the Belke Coast still have Water Spiders even after defeating the boss?
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Oh yeah, that's a thing. You actually reminded me just in time! Come to think of it, I should probably add Reflect Element to that bookshelf.
Yep, the Water Spiders and Sand Crabs are always there. Presumably, they make their nests near the rocky terrain on the east side, but normally avoid the human-patrolled west side unless forced to go east by an outside stimulus.