Dark Pokemon are Psychic Pokemon's weakness.
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flying type psychic type
EDIT: and dark. physical
fighting type pokemons weakness are psychic and flying moves steel is weak aageinst water fire fighting and ground
every game has the same types and weaknesses. as usual psychic is weak to bug and dark type Pokemon in all games, not just Pokemon platinum.it's also weak to ghost
Mostly fire element's weaknesses are Water and Ice.....BUT...on some fire type Pokemon's Weaknesses also include Psychic.....Happy Training you Pokemons!