PokéBase - Pokémon Q&A
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2 Answers

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You have to get to Sootopolis City where Steven and Wallace will be waiting for you. They will take you outside Origin Cave, where Groudon lies. Once you catch / defeat Groudon, you can make your way to the Sootopolis Gym in the center of the city and it should be open.

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Beat/catch Groudon

The Sootopolis gym door should be open after that little Groudon event. If you kill it, beat the elite 4 and it should reappear.
Hope I helped!
-It's a secret!

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