After the confrontation in Mt. Moon and Cerulean, you will go through the game without any Rocket interference until you happen upon Lavender Town. You will confront them again in their Celadon hideout, and then, finally, at Silph Co. in Saffron.
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Defeat Team Rocket's Boss in the game corner he will leave the silph scope behind take it then leave.
You have to beat the elite four and defeat team rocket for the last time on four island, get the sapphire, and give it to Celio.
Go through the rocket game corner and defeat team rocket's boss Giovanni once he goes away an item will appear take it its the silph scope.
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
im not sure off the top of my head what the passwords are but you have to ask the team rocket members after you defeat them in a Pokemon battle and that's how you get the passwords