How do you get to the third gym leader in Pokemon leaf green?

Answer 1

when you are at cerulean city, defeat mysti, in the city there is a house with a cop in front, enter and pass by the hole, after walk down and you will see two little house. You don't need to enter in the first one, it's only a daycare, enter in the second one, go in the underground path. You will arrive at Vermillion. Go in the SS anne, learn cut from the captain and cut the little three above the third gym.

enter, press a in front of each white little things in the ground. Two will unlock the door. The switch aren't in the same white tings two times, so try a lots and you will find them.

Lt Surge use only electric pokémon so beat him with a rock or a ground one. I hope that will help you, sorry for the mistake, I speak french, so my English can be better...