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.
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The second gym leader in Eterna city
First, you challenge the gym leader then cut down the trees in front of a tall building (in platinum, a building a sphere on top).
You can find the 2nd gym in the south part of Eterna City.
Eterna City
win the gym leaders (you can find the gym at Canalave City, Oreburgh City, Hearthome City, Eterna City, Pastoria City, Veilstone City, Snowpoint City and Sunyshore City) and you'll get 1 badge for every gym leader you'll beat