In Area 3 of the safari zone in fuschia city.
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BIlls house is located in Goldenrod city. you take a path above the Pokemon center and his is the only house there. There is also a House belonging to his grandfather above cerulean city. If you show him the Pokemon he describes you can get a fire,water,leaf,and thunder stone. the four Pokemon needed are oddish,staryu,vulpix,and pichu.
Use repel and sprint around
You can get it in Vermillion City in the house that is next to the Pokemon Center.
There is a basement lab with a bunch of scientist and wild ditto, there is an item ball with the key in it.
In the game Pokemon Yellow you have to beat the leader of gym seven in order to win the Volcano Badge. The leader of this gym is named Blaine and he specializes in fire type Pokemon. To enter this gym you first have to get the secret key. This key is located in the building across from the lab.