you go to the lost tower and get to the top(only if you beat geovoni in the rocket hideout in the game corner) and use the silpth scope and don't catch the marohawk, it can't be caught. then you use the Pokemon Flute to get past a snorlax and go down to fuschia city for your fifth badge
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The fourth gym at Pokemon fire red is grass type gym
after you beat brock in pewter gym
after you beat the fire gym then walk out and your rival will give it to you.
You have to beat team rocket in Silph Co
After you beat Sabrina, the 6th gym leader in Saffron City, you can use Rock Smash.