You have to defeat all of the gym leaders.
You collect all 8 Kanto badges.
he tells you that you need to get all of the badges from Kanto then he will let you into Mt. Silver
just collect all Kanto gym badges
Get the Jhoto badges, beat the elite four, go get all of Kanto's badges as well.
Defeat all the Kanto gym leaders. While you are able to do most of them in any order, Blue can only be fought if you have the other 7 Kanto gym badges.
16, including all johto and kanto badges
you gat all kanto badges
You can get all the kanto badges and catch some kanto pokemon, too.
you have to get all the gym badges in kanto
there is 16 badges... 8 in kanto and 8 in johto
Get all 8 badges
to fight the elite four after obtaining all of the kanto badges, just head back to where you faced them earlier after getting all the johto badges