Do you mean "what are Dark-types weak against?" Bug-type and Fighting-type moves will deal double damage to Dark-types.
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Giratina's weaknesses are Ice, Ghost, Dragon and Dark.
Dark Pokemon are Psychic Pokemon's weakness.
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
ghost and dark
As of Generation 5 only the pokemon Spiritomb has no weakness because of the dual-type Ghost/Dark.