Fighting and depending on it's second type can be whatever
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The fighting type is weak against Ghost and Dark Pokemon, so a Sableye would be good.
Fighting type and bug type are strong against dark type Pokémon.
A psychic, dark, or steel type Pokémon.
Psycic Pokemon are weak against Ghost type, Bug type and Dark type. Psychic types are good against Fighting and Poison types since Pokemon Gold (and onward)
Psycic type is good against Dark type, if you are playing Pokemon platinum then you can get a Ralts outside Hearthome all you need to do is train it up to lvl 26ish and it will help lotz with Fantina This will have the opposite effect. Psychic is weak against Dark, and even so, the Gym is GHOST. In addition to this, Psychic is also weak against ghost, so use a good fighting or bug type. Machamp or Scizor are good choices.