do you mean the tanoby key? use trial and error. i can't really explain it.
Go to the Ruins at Pokemon fire red or leaf green. Just use ultra balls... The ruins east of the Day-Care place. It's called Tanoby Ruins
Push the boulders into the holes.
You can get Pollywhirl in Pokemon Leaf Green in Virdian City.
The six island in some ruins.
The Pokemon you can get in fire red and not leaf green are Electabuzz and Scyther.
you can't get mamoswine in Pokemon leaf green because it doesn't exist in leaf green
there is no Pokemon green leaf and Pokemon leaf green you can't only diamond pearl platinum heartgold soulsilver and maybe black and white
Unown are unavailable to catch in Pokémon Emerald Version. They appear in Fire Red and Leaf Green, in the Tanoby Ruins on Seven Island.
No only Fire Red and Leaf Green and trade it from Pokemon fire red and leaf green
behind the door is leaf green u enter the Pokemon leaf green world
She does its either Leaf or Green.
you dont i think