How do I get the fifth gym badge.?

First defeat the 4 gym go outside then talk with the galactic grunt outside the safari then you must go after him and on the last a battle and if you defeated him, chyntia comes and give you the secretpotion for the psyducks on the way to celestic town. Talk to the psyducks and they go away. Then chyntia comes again and ask if you want to deliver a old charm to her grandma. Say yes and you can go. On that route there is a lot of fog so be carefully. If your in celestic town go to the ruins. On your way to the ruins of celestic town. YOU MUST BATTLE HIM. After that go inside the ruins there you see a wall painting of uxie azelf and mesprit. Press the a button and after that the grandma of chyntia comes and she tells the story of uxie azelf and mesprit. After that you deliver the old charm and then you get the HM surf. And then you can go outside and you can battle the fifth(PS:i know it's a whole story but it helps.)