Well, somewhere along the Galactic warehouse, you might be able to find it somewhere.
In Veilstone city
go to velstone city and then go down and you will get to pastoira
in velstone city after you beat the galactic boss in the building he gives you one
bla87 said:i have a deoxys on Pokemon diamond and i touched one of the meteors in velstone city and deoxys was in my party and he changed forms one of the meteors changes his form to defense form
After beating the Pokemon league there will be a passage under velstone city and you got to catch all the unknown to get the passage
two words POKEMON PLATINUM in the route to velstone city u will see syther EVERYWERE!!
You don't need to if you defeat Diagla you you cant' see him anymore make sure you have the master ball Cyrus gave you At Galactic headquarters in Velstone City use it to catch Dialga (if you didn't use it already).
you have to beat the snowpoint city gymleader go to the lake by it then go to the front of the galatic velstone bilding talk to the grunt in front of it and he will drop it
Synshrone city is not a real city in Pokemon Diamond.
Blackthorne city is not in Pokemon Diamond but in Pokemon Heart Gold/Soul Silver
In Velstone City in the Team Galatatic's warehouse.
Comarder Saturn isn't found in Mt. Cornet or on the peek. He is in the Team Galactic HQ building in Velstone city.