Getting to Black City (Black verison) uses the same concept as getting to White Forest (White version). You have to defeat all the gym leaders and earn all the badges, then go defeat the elite four (in any order you like), then defeat N and Ghetsis of Team Plasma. After this you get to sit through the credits (fun, eh?!) and finally you'll arrive back in your house in Nuvema town. At this point there will be no guards blocking the eastern area of the Unova region, so you can go to Black City/White Forest.
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you need to get tea in celedon city and give it to the guard
you dont on less you hack pokemon soulsilver/heartgold. but be careful if you hack because hacking is illeagle
to get past the guard you have to go to the Pokemon mansion in celadon when you enter there is a old lady on the first floor she will give you some tea just go to where on of the guards are and wala you can now use every shortcut there is including the one to saffron city hope i helped
you have to get through silph co and beat giovanni again to get the guard to go away!!! i know it sucks the people who made it that way are M-E-A-N mean
If you mean the guard by the elavator, you can't get passed him.