The third gym is Fantina's gym and she has ghost Pokemon. As long as you have a Pokemon with bite or crunch, it should do okay. Otherwise, you could just use a Staravia. Since it is part normal type, all ghost type moves are effectless. One thing to look out for is curse. It will take out 1/4 of your max hp EVERY TURN! Bibarel might do good.
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you can do about anything after you just cant beat the gym leaders again.
you go to sunyshore city and beat the gym leader
go to hearthome city
lv 30
you go on to the next gym witch is etrake city