In Pokemon Gold, Silver, and Crystal the elevator is not accessible. In Pokemon HeartGold & SoulSilver you can take the elevator up if you have Rotom in your party and you can take it to a room to change it's form.
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bring rotom and make sure he is first and go in the elevator and you will see rotom forms
go to celadon city and on the top floor there is a person who sells drinks buy one. go right to a officer who tell you he's thirsty give him the drink and that will take you to saffron city . from then just go across intill you find a big building without a team rocket on the door that's it but i suggest you go to the Pokemon centre first and the gym (only one's open if you defeat all of them you can pick one of 2 Pokemon) good look.
In Pokemon Gold, Team Rocket has been defeated and the Silph Co. office building is mostly empty. The player can go inside and find an Upgrade item however.
you have to beat all the kanto and johto gyms, then you can see prof. oak and he will give you a kanto starter (bulbasaur, charmander, squirtle)yes.and you have to defeat pokemon trainer red at the top of mt. silver but you need all 16 badges.then you talk to professor oak his office in pallet town his office is in the bottem right corner and you can choose from Bulbasaur,Charmander,or Squirtle P.S Squirtle should be in the middle ball.when you defeat the elite 4, you go to professor oak. talk to him and he will let you choose one of the 3 starters in the kanto region.
If he's a rocket grunt, you have to go to the Silph Co. Office Building and save the manager by betting the rocket leader (His name escapes me at this point). I hope this helps you enjoy the game. :) -Aura-