Zapdos is not at Mt Silver but next to the power plant in cerulean. You can battle it after getting 16 badges.
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you can find zapdos in the power plant.
moltres=mt silver zapdos=powerplant articuno=seafoam islands you have to beat the 6th gym leader in kanto to catch em
Mt. Silver F1 in the Back Room. Mt. Silver in the Entrance. Mt. Silver 2F by Red, and the Safari Zone.
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.
If Moltres,Zapdos or articuno runs away you need to use action replay to get them back