the fourth gym leader is a ghost type fighter. to battle her, you must defeat the pastorian gym leader. extra info: the pastoian gym leader is a water type fighter so try cathing a shinx and train it for it to learn spark or discharge. the fourth gym leader will be easy to beat, all you need to do is catch a girraferig and train it for it to learn psybeam.
wellll........., that's it.
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The fourth gym leader is Erika, the Grass trainer.
The first gym in Pokemon diamond is in Oreburgh City
The fourth gym at Pokemon fire red is grass type gym
a gym leader can't teach a Pokemon that move but you have to defeat the 6 gym leader in order to teach that move
in the forest by the 2 gym leader