By using flying bug and fire pokemon if possible
i don't know, i asked the question.
use a flying , poison or flying Pokemon
gardenia - grass type
gardenia is in eterna city, near the bottom.
gardenia is the grass gym leader of eterna city u can see her at the haunted house but u must beat her in a gym battle
With a water type pokemon.
You will first find Gardenia in the forest in front of the Old Chateau just before Eterna City. Then, you will find Gardenia in her gym at the bottom right hand corner of Eterna City.
You defeat the gym leaders in Pearl. ~KKMG1
Defeat Palkia
You have to go to the Eterna City Gym. When you enter, all's it is is one huge maze of trees. The only way to get to Gardenia is to defeat the other three trainers in the room. But you have to find them. Good luck.
eterna city gym leader gardenia she uses grass types
Gym Leaders: Roark, Gardenia, Maylene, Wake, Fantina, Byron, Candace, and Volkner.