If you head East from Cerulean City (you need Cut) and then South you will encounter the Rock Tunnel you need to pass through to continue to Lavender (then onto Celadon). To pass through the Rock Tunnel it's recommended you use Flash. (It is passible without.)
use fire
revive a pokemon from a fossil and beat the fire gym leader Actually, you need to get the key from the Pokemon Mansion. It wouldn't make sense to require you to beat the gym in order to unlock the gym!
make sure you have fire Pokemon with you and you will win easy
You must go to the Pokemon Gym. Beat the gym leader and he awards you with the 8th gym badge
Go back to your dad's gym and battle him, then go to the house next to it and get HM surf
beat the gym
the best way to beat the 7th gym leader is with a fire type Pokemon
With good Fire of Fly Pokemon!
beat everyone in silph.co and you can get into the saffron gym
use fire
Get a good fire type Pokemon
revive a pokemon from a fossil and beat the fire gym leader Actually, you need to get the key from the Pokemon Mansion. It wouldn't make sense to require you to beat the gym in order to unlock the gym!
You have to beat Erika, who is the fourth Gym Leader, raises Grass-Type Pokemon, and resides in Celadon City.
make sure you have fire Pokemon with you and you will win easy
beat silph co. building then the gym will be open
Flash, I believe.
You must go to the Pokemon Gym. Beat the gym leader and he awards you with the 8th gym badge