larvaridge town, you need to beat maxie on mt chimney to get there though.
The fourth gym leader is Erika, the Grass trainer.
The fourth gym at Pokemon fire red is grass type gym
The fourth gym leader is Flannery.
just beat the fourth gym leader
The fifth gym leader in Pokemon platinum is crasher wake but you get the fourth badge.
The fourth gym leader hates ghost type pokemon. ex:Gastly
The fourth gym leader is Maylene in Veilstone City, a fighting type gym leader.
the fourth gym its a fire gym
In Gold the fourth gym Leader is Morty. Morty specializes in Ghost type pokemon, and his gym is located in Ecruteak city.
The fourth gym is in Ecruteak City. It is a ghost type gym and the leader is named Morty.
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
Her name is Erika