I don't know which game you're talking about, but these are all of the most recent games in the past 15 years.
Firered/Leafgreen: Walk to Misty, battle two trainers.
Ruby/Sapphire/Emerald: Battling trainers give you more light. You'll eventually find Brawly.
Pearl/Diamond: Battle all of the trainers in the room, then Gardenia will appear.
Platinum: Battle each of the four trainers, and the Floral Clock will eventually turn to Gardenia.
walk in the gym
The second gym is in Eterna City. The gym leader is Gardenia, who specializes in Grass-type Pokemon.
first of all, the other people in the second gym leader's gym are not gym leaders. they are just trainers who use grass-type pokemon, just like the gym leader. they are sometimes hidden behind trees and one or two is hidden in some flowers.
its a normal type gym leader named lenora, gives out basic badge
you have to beat the gym leader
The second gym leader is brawley of Dewford town. You will come to the PetalburgGym second, but that's the last gym leader you'll battle.
The second gym is the Dewford Town Gym with Gym Leader Brawly.
The Second Leader Is In Eterna City
walk in the gym
He is in the lighthouse
Eterna's gym leader can be found in the Eterna Gym After defeating the three trainers hiding in the trees inside the gym you can find the gym leader at the northern (upper) part of the gym.
Step on the portals until you get to the gym leader.
The Pokémon the second Gym Leader has in "Diamond" are Cherubi, Turtwig and Roserade.
The second gym is in Eterna City. The gym leader is Gardenia, who specializes in Grass-type Pokemon.
Lenora, the second gym leader, is found in her gym AKA the museum in Nacrene City.
Danny
first of all, the other people in the second gym leader's gym are not gym leaders. they are just trainers who use grass-type pokemon, just like the gym leader. they are sometimes hidden behind trees and one or two is hidden in some flowers.