Dark-Type Pokemon are weak against:
Fighting-Types
Bug-Types
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though nothing is naturally supereffective against ghost/dark Pokemon like spiritomb and sableye, if a Pokemon uses foresight, fighting moves become supereffective if neither Pokemon are switched out. good luck!
Fire types, flying types, and rock types are supereffective against bug types. Grass, dark, and psychic types: BEWARE OF THE BUG.
Water types, leaf types, and fighting types are all supereffective against a rhydon
rock type Pokemon use magnet bomb on a rock type Pokemon like graveler it will be supereffective.Steel is supereffective against ice and rock. Trust me, I'm a doctor.
I think that the Dusk Ball can be brought at the Poke Markets at Solaceon Town, Pastoria City and from any Poke Markets from their on.