Zapdos is not at Mt Silver but next to the power plant in cerulean. You can battle it after getting 16 badges.
Abandoning Power
Seafoam islands, Power plant, Mt ember, Cerulean cave.
Zapdos, Articuno and Moltres are all at level 50 and can be found at the Power Plant, Seafoam Islands and Mt Ember. Zapdos, Articuno and Moltres are all at level 50 and can be found at the Power Plant, Seafoam Islands and Mt Ember.
There are schematics available on the web for about $30 plus shipping and handling.
Zapdos is in the power plant Articuno is in Seafoam islands and Moltres is at Mt. Silver
you don't find them in mt silver, you find articuno and zapdos in their original places; zapdos-outside power plant articuno-in seafoam islands
You can capture Moltres at Mt. Ember Peak and Zapdos in the Power Plant in FireRed.
Curilean Cave Mt. Ember/One Island power plant Safoam islands
The legendary birds are found at the power plant, mt ember and seafoam islands.
Mt. Helena once erupted, and the explosion was 20 x the explosive power of an atomic bomb.
Mt. Fuji, Mt. Naka, Mt. Tokachi, Mt. Okuhotaka, Mt. Hidaka, Mt. Chugoku, The Japanese Alps, and someone can add on to this. :D