you need to get two passwords the first one you get is in island 1 (mt ember) by 2 rocket grunts the secon you get is in dotted hole on island 6
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I think it's the Silph Scope that you need for Lavender Town and it's in the hidden Team Rocket base in the Celadon Game corner on the 4th Floor and Giovanni has it.
It is underground
after beating the team rocket executive the murkrow knows the answer and you need to follow it through the base to the door
From Lance after you infiltrate Team Rocket's Secret Base in Mahogany Town.
you have to defeat team rocket at their secret base at the game corner and the boss drops it after you defeat him