Go see Prof. Oak after you defeat Blue, the final Gym Leader. Either that or he'll call you as soon as you exit--I'm not sure. Oak will tell you that he's going to pull some strings to let you into Mt. Silver, so just fly to the gate and the guard should be out of the way.
You first have to beat the Elite Four for the first time and then you have to get all of the Kanto Badges and he'll let you pass
beat red then you can get pass
beat all the gyms in kanto, then talk to prof. oak, he tells the guard to let you pass in the walkway before victory road, go to the left and enter walk a little bit then you're there
There are a couple of guards on Victory Road. If you mean the first guard you meet, you have to have all 8 Johto badges. If you mean the guard on the right, that becomes open after you beat the Elite Four + Champion and talk to Professor Elm. If you mean the guard on the left, then you have to beat the E4+Champ for a second time, then talk to Prof. Elm to get the pass to Mt. Silver.
Im sorry but you have to get all 16 badges and the police man AKA: gay will let you pass
Mt. Silver is near Victory Road. You have to defeat the champion first to go to the left in the entrance. Then you can come to Mt. Silver.
Mt. Silver F1 in the Back Room. Mt. Silver in the Entrance. Mt. Silver 2F by Red, and the Safari Zone.
first you need to contain all of the 16 badges and both of the police men will not guard you from passing mt. silver!
The bottom of Mt. Silver is on Route 28.
its in mt. silver
Go find Prof. Oak, then he will give you access to Mt. Silver. It's located beside the entrance of Indigo Pleateau (if you took notice, previously there'll be a guard blocking you). There locates your destination, Mt. Silver. Pokemon Trainer Red is at the top of Mt. Silver, so prepare to fight the strongest trainer in all Pokemon history!
You need to have the Blue Orb. After you defeat Red at Mt. Silver, go see Professor Oak at his lab in Pallet Town. He will give you one of the three Kanto starters. Then go see Mr. Pokemon. He will give you the Blue Orb then the guard should let you pass. Oh, and you also need the National Dex.