shadow types dont exist, u mean ghost i bet
ghost works good on ghost believe it or not and also dark
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Bug types and dark types and ghost types are super effective.
grass types are
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)
Poison and Steel types are super effective against Fairy types.
Basically the only weakness is water, other types are normally effective or not effective on fire at all.