How is Ghost weak to Darkness?

Question

I mean Ghosts live in the dark, Dark types should be weak to Ghosts.

Comments

Game Freak logic.

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Answer 1

>Bad and dark deeds during a lifespan are believed to make the afterlife bitter. So I would associate this belief with the possible reason why ghost types are weak to dark types even after being so similar.

Quoted from DB~Valet.