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.
You can't.
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.
You need to get latias ( can only catch it on Pokemon heartgold) and latios (can only get it on Pokemon soulsilver) and speak to steven who is in the silph co. in saffron city.You must get the Enigma Stone from the WiFi event, which turns out to be the Soul Dew.
You can find Steven in both HeartGold and SoulSilver. He is in Saffron City. He comes towards you after you retrieve Copycat's doll from the Pokémon Fan Club building after you talk to Copycat. Once you leave the building, he comes and tells you about Latios (in SoulSilver) or Latias (in HeartGold). Afterwards he can be found in the Silph. Co. building in Saffron City.
Use the Rotom you caught in diamond, pearl and platinum.
i'm not sure in soulsilver but in heartgold after seeing him in the pewter museum you can trade him at silph co
You will need an event item called Secret Key, then you need to go to Silph Co HQ
You can't.
In the Silph Co. building in HeartGold and SoulSilver, in order to gain access to the second floor, Steven Stone cannot be in the lobby and you also must have a Rotom be the lead Pokémon in your party.
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.
saffron city
You need to get latias ( can only catch it on Pokemon heartgold) and latios (can only get it on Pokemon soulsilver) and speak to steven who is in the silph co. in saffron city.You must get the Enigma Stone from the WiFi event, which turns out to be the Soul Dew.
Talk to Steven in silph co. after beating trainer red
He is in Silph Co. but you need to trade rotom over from Pokemon platinum
You can find Steven in both HeartGold and SoulSilver. He is in Saffron City. He comes towards you after you retrieve Copycat's doll from the Pokémon Fan Club building after you talk to Copycat. Once you leave the building, he comes and tells you about Latios (in SoulSilver) or Latias (in HeartGold). Afterwards he can be found in the Silph. Co. building in Saffron City.
Yes, but you must see Steven in the Silph Co. after beating Red.
saffron city (in Kanto) and it is not abandoned anymore