How do you defeat Team Galactic's Head Quarters?
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You have to obtain 7 badges and gotten the Galactic Key in their Warehouse. Then, beat Cyrus and the Commander, and release the 3 Pokemon, and then you're done with the place, and you have to go to the top of Mt. Coronet from there.
Get Pokemon at level 50 between 60 and get a lot of antidotes!
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