You need a rotom then you can get to the next floor where you can change rotoms form and to get rotom you have to trade from diamond pearl platinum
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I posed this question becuase the answer was really hard to find. If silph co has no people in it at all it's because you have rotom in your party. Silph co's main purpose is to transform rotom, but when you enter the building with him in your party the place is vacant. All you have to do is go in without him in your party and there will at least be a man at the desk.
there is no silph co in that game
In HeartGold and SoulSilver, you can access the 1st floor of Silph Co. as soon as you enter Saffron City however you can't go into the elevator in order to get to the 2nd floor unless you have a Rotom as your lead Pokemon.
no you will not meet Gary at the Silph Co. you will be battling Giovanni there.
On the 5th floor of silph co.