Fantina's weaknesses are only dark types. Normal and fighting won't effect her, she will KO psychic types, and any other types are just normally effective. (Try teaching your Pokemon moves like Crunch or Faint Attack, Shadow Ball is actually ghost type)
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Dark Pokemon are Psychic Pokemon's weakness.
The weakness of flying type Pokemon is Ice, Electric and Rock.
Ground is electrics only weakness.
there weakness is Grass,water and rock
As of Generation 5 only the pokemon Spiritomb has no weakness because of the dual-type Ghost/Dark.