Assuming you are in Vermilion City and you have already gone to the S. S. Anne to retrieve HM CUT, go to Digletts cave and go out the other side to route 2. In one of the houses there, you will find Prof Oak's Aide who will give you HM Flash.
Go back to Digletts cave, then back to Vermilion City (left) and go north, back to the underground path. When you reach route 5 go up and go toward the east of Cerulean City (to the right) to where the small tree was, where previously you were blocked. Keep going, there are more than a handful of trainers there ready to battle. If you keep going you will eventually reach a Pokemon Center, toward the left of the Poke Center there is a cave. That's Rock Tunnel and the only way you can reach Lavender Town. Toward the West of Lavender Town is Celadon City, you should focus on the Game Corner there, which happens to be one of Team Rocket's hideouts.
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after you beat the fire gym then walk out and your rival will give it to you.
get the key in the od mansion on cinabargo to cinnibar island, then go in that place next to the gym and look for secret key. then get out and then you can go in the gym in cinabar island
you have to go too Fushia City beat the gym leader then they will let you in Saffron City then go in to Silph Co. and get to the last floor find Giovanni battle Giovanni then then get out of Silph Co. and you can go in the Saffron gym.
You go to the old wizard on the third island and he will give you one for help.
After you beat the gym, you must leave, heal ur pokemon, then go back and talk to the leader and she should give you the badge