you beat Kyougre or catch Kyougre in the cave of origin then when its not raining go to wallace's gym!
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sort of you have to beat team aqua 1st
You get it from Sootopolis's Gym by defeating the Gym Leader.
You can get in once Steven and Wallace grants you the permission
Wallace, but you can also fight Steven.Wallace is the last gym leader, and is the champion of all gyms, but Steven is the reigning Pokemon Champion, and is the champion of all gyms and the Elite Four, so Steven is the true champion.
In Saffron city there is a man in the safari zone in the far upper left that will give it to you.