1. Take the only warp square.
2. Take the bottom-left warp square.
3. Take the bottom-left warp square again.
4. Take the top-right warp square.
5. Take the bottom-left warp square.
6. You should be in the gym leader's room.
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Rock smash
Use the portals (Hint: The bottom right portion of the gym has the exit portal).
After you've beaten all the previous gym leaders(Brock, Misty, Lt. Surge, and Koga), and have obtained the tea from celadon, you can fight Sabrina, whose gym is in Saffron. Your Pokemon should be lv.'s 40+.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
go to saffron city to beat Sabrina to get the 6th badge however you need to first go through silph co to do this.