>>41742054max defense max HP impish
reflect, light screen, foul play, twave
because so much of this meta has a gargantuan attack stat, foul play is actually a good move to have. the bulk you get from running max defense is worth it because it lets you tank hits from excadrill, garmanitan, etc after setting up a reflect.
alternatively, you could run
reflect, twave, foul play, draining kiss
since most of the meta is physically offensive, and the most popular special attacker currently has infiltrator anyway. (and you wall it regardless)