Because you are playing platinum, a good thing to do is catch a Ralts. Train it so it evolves into a Kirlia, and get it to about level 25-27. By that time it should learn psychic, and will be super effective on ghost types. But beware, because ghost type moves do 2x damage to psychic type pokemon.
If you can, catch a male Ralts and then evolve it into a male Kirlia, and use a dawn stone on it. It will evolve into Gallade. Although Gallade's sp.atk is low, it is duel psy/fght type.
Fantina is a Ghost type gym leader, meaning normal and fighting types won't have any effect.
You have to beat the Hearthome gym leader then you can get through. (do NOT use normal type moves on her because she has ghost type poke'mon and normal type moves won't effect ghost type pokemon).
you go to sunyshore city and beat the gym leader
Ghost and dark type
go to hearthome city
Fantina is a Ghost type gym leader, meaning normal and fighting types won't have any effect.
You mean Fantina? If so, go to Canalave city. The gym leader there uses steel Pokemon. Hope I helped.In platinum after Fantina, who is third leader, go to veilstone city and beat Maylene. She uses Fight-type pokemon.
The Gym Leader is easy to beat. She mainly use's ghost type Pokemon. Ghost Pokemon are weak against Physic Pokemon. Trust me if i can beat her you can.
beat gym leader Candice
beat 50 trainers
ponie
You have to beat the Hearthome gym leader then you can get through. (do NOT use normal type moves on her because she has ghost type poke'mon and normal type moves won't effect ghost type pokemon).
you go to sunyshore city and beat the gym leader
grass types
You have to use Pokemon with dark/ghost moves dark and ghost are the only types that are super effective on ghost
Ghost and dark type
go to hearthome city