Question

Where is the key in platinum that opens the galactic wearhouse doors in Veilstone city. You know the doors that take a speicial key. It is supposed to unlock teh security system so you can get into the basement.

Answer 1

North East in Veilstone City, there is the Team Galactic headquarter, it's a huge building, you can't miss it.
Just Outside the building is a Galactic grunt staring at an antenna, talk to him, he will get nervous, run of and leave the storage key just where he stood.
Now head to North West of veilstone city where you should find the warehouse, the storage key will let you open the door, go trough the galactic headquarter basement (this is just a stair down from warehouse, here, you find the galactic key.