beat the elite 4 then travel through diglet cave once you reach pewter city then go south till you reach pallet town
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Pallet Town is where it normally is, south of Viridian city.
Go through diglett cave.
it is in pallet town. it is the building with 4 circle windows.
after u get all the badges u go to oak in pallet town and he will giv u it
I'm guessing you have to defeat all 16 gym leader's before you attempt that...