Buy fresh water and give it to the guard
Chat with our AI personalities
you get it at the celedon mansion on the 1st floor, you talk to the person with the meowth and other walking pokemon. after that she will give you the tea which you can give the guards in the passage way thingys. the celedon mansion is the building where you get eevee from but instead of the back enterance use the front 1.
Go to Saffron City by giving the guard the tea you obtained from the old lady in the mansion. Then go into Silph Co.
No. They were made after Pokemon Yellow.
No, you cannot get Lugia on Pokemon Yellow.
Yes you can trade Pokémon between two Pokémon Yellow games.