You fly Veilstone City go to the Galactic building and talk to the Galactic member outside the warehouse.... YOU MUST DO THAT he will then drop the warehouse key (which is also located in veilstone city and continue from there.
Hope dat helped (=
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you have to go to lake verity first then go to acuity.
Mars does not appear at lake acuity. If you beat mars at lake verity then go to the upper part of mt coronet and explore until you reach snowpoint city. If you're at lake acuity and beat Jupiter then go to the galactic HQ in veilstone city.
After you go to lake acuity you must go to mt. coronet and catch giratina. After that,the major blackout in sunyshore city finishes off and you go there and battle the gym leader.
go 2 spear pillar
go to snowpoint city ;)