After you get HM03 (Surf) and beat Koga, you have to fly to Pallet Town and surf to Cinnabar Island. After you are there you have to go to the Cinnabar Mansion and find the Secret Key and Use it to unlock the door of the gym. After you are in the gym you must answers a series of questions or face the gym trainers. Then you can face Blaine for the Volcano Badge. His team is a level 48 Ninetales, a level 50 Rapidash, and a level 54 Arcanine.
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Head back to Viridian City and challenge the gym there (it will be open now) to get your 8th badge. After that come the Pokemon league.
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.
seafaom islands up the ladder
in blackthorn city
No. They were made after Pokemon Yellow.