back to Vermilion and cut the bush down blocking the gym entrance.
Inside, you'll find some of Lt. Surge's goons are stationed
throughout the gym. Remember, they like to use electric-type Pokémon
just like their mentor Surge.
To open the gate leading to Surge you must search inside the
barrels around the room. There are 2 switches inside them which move
randomly each time you find one and not the other. The 2nd switch is
always either above, beside, or below the 1st one. This is a
very frustrating puzzle so try to be patient, this won't be easy
I'll clue ya'.
Defeating Surge is a piece of cake. If you head to Diglett's Cave
you can catch a high level Dugtrio with Dig that can obliterate all
of Surge's Pokémon before seeing what hit him. Or in the Blue and
Yellow versions you could have a Sandshrew leveled up pretty good to
take on Surge's Electric Pokémon.
After clobbering Surge he'll give you his Thunder Badge and TM24.
This badge allows you to use the Fly ability once you get the