Your 4th would be Maylene the Fightning Gym Leader. Now you must go south of Veilstone and follow the path to a Grand Hotel then south on to the beach and continue your path to Pastoria for your 5th gym.
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The fourth gym in platinum is the veilstone gym
The fourth gym at Pokemon fire red is grass type gym
The Fourth Gym is in Lavaridge City.
where can i find the second gym in Pokemon platinum
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.