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You will need Galactic key and this how to get Galactic key you will need to talk to a Galactic team mate by the Galactic HQ.
A galactic centre.A galactic centre.A galactic centre.A galactic centre.
Not yet - Milo is going to build them.
In the galactic warehouse
to the left of the Galactic HQ
go to galactic headquarters in veilstone city then you need a galactic key and the storage key to open the door of team galactic's door