Where is the 6th gym leader at

[Ecaf]

Ive looked every where but i cant find them.

[Yagami]

I think you are talking about Crawli,the bug type gym leader.After defeating Crawli's dad in terajuma jungle,talk to Melia in Kakori gym.Then go to the ship and talk with the captain.Then he will help you go to the secret shore.

[Ecaf]

ok thank you