The Galactic Grunt in Pastoria City has it. You need to bet the Gym to get it.
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In the galactic warehouse to the left of the Galactic HQ
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you MUST beat the snow point gym leader to get the key. After you beat the snowpoint gym leader you go to the Team Galactic warehouse located right of the veilstone shopping center and battle and beat a team galactic guy. Then he will drop the key and you pick it up. I hope this was helpful to you! :}
it is in the team galactic headquarters in veilstone
in veilstone city the team galactic warehouse the HM fly will be their.