Nothing, There is no stuff to do there, That is the place that made your Pokegear that's all.
there is don't listen to that fool if you have rotom first in your party go in the lift and it takes you to its forms if you go to the fan first it will want to learn air slash by the way you cant get rotom in soulsilver or heartgold you got to get him in diamond pearl or platinum
Also,when you've defeated Red,The Elite 4 from Kanto,and met Steven you could get one of the hoenn starters
Red stone=torchick
blue stone=mudkip
green stone=treeko
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there is no silph co in that game
Use the Rotom you caught in diamond, pearl and platinum.
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.
On the 5th floor of silph co.