for the windmill the old guy in the meadow has it
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you have to beat the snowpoint city gym leader go to the lake by the city go to the front of the galactic velstone bilding there will be a grunt talk to the grunt and he will drop the key
The Galactic Grunt in Pastoria City has it. You need to bet the Gym to get it.
which key there are a ton
You get the Lift Key on B4F when you battle a Team Rocket Grunt in the far north corner. He even says "Who has the Lift Key" before the battle begins. He has a Level 21 Zubat and Koffing. Once you defeat him, then he will drop the key.
A rocket grunt drops the key on B3.