You have to beat all 16 gyms and then talk to prof. Oak and he will allow you to go to Mt. Silver.
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Beat all of the gyms in kanto and then go to the professor he will probably give you a pass then go to mount silver.even if he does not give you any thing still go to mount silver any ways
Technically Ash is not in Pokemon Crystal, instead there is trainer Red but we all know it is Ash. Trainer Red (Ash) is located in Mount silver. After you get every badge in the game, go to prof. Oak and he will unlock mount silver for you. you must use flash to see inside the cave and look around for Trainer Red.
in mount silver go up the waterfall rather than the rocks.
you first have to get the 8 johto badges and beat the elite four then you have to get the other 8 badges from kanto then go to prof. oak in pallet town and he lets you go to mt. silver which is the hallway before you go to victory road