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By beating the elite 4
Defeat all 8 Pokemon GYMS in KANTO. Then talk to Prof. Oak in Pallet Town and he'll unlock it for you, after that, go to Viridian City and the 2 dudes who are blocking the entrance to Mt. Silver should disappear and you should have access to Mt. Silver to fight Red.
The guy blocking the cave is Cyrus and he is in spear pillar after you meet him the first time but you need 7 badges to get to spear pillar
The cave is in the back of Sootopolis city but there is a old man blocking the way, and I am having trouble getting the man to move.
Get the natinal dex
Wait two weeks and it will disappear.
You have to beat the elite 4 first. Then he will disappear
He should be in that cave next to Cerulean city. You have to be the elite four first and then the man blocking the cave will disappear. Then you have to get through the cave, which will take some time
It will disappear, giving you access to that cave. However, I'm not so sure if Snorlax returns after beating the Elite four.
Snorlax is located in Kanto, blocking the entrance to Diglett's Cave outside of Vermilion City.
I think it is behind the dragon gym, you have to have a pokemon that knows surf and I think whirlpool as well.
beat Clair i think. once you beat her the old man will let you in
By beating the elite 4
In the far north corner of Blackthorn City. Cross the water using surf and enter the cave (if no one is blocking it.)
you mean dragons den? you have to defeat Clair the gym leader first.
You'll need the HM Whirlpool and teach it to one of your Pokemon and you can pass the Whirlpools blocking Whirlpool Cave.
Yes you do before Victory Road.