>>58710946My own thought is that Grass should resist (and maybe be super-effective against) Ghost.
In old folklore there are plenty of herbs and plant-based crafts (like wooden dream catchers) to ward off spirits and the like.
Take that principle and apply it to Pokemon. The plant-based type would ward off the spirit-based type.
You could possibly apply this to Fairy as well, since those are somewhat spirit-adjacent.
Grass is already decent offensively, to being super-effective against those types may not be really needed.
Guess it depends on how badly you want Ghost and/or Fairy nerfed.
