"The fourteenth gym leader, Sabrina, is missing from the gym on Friday night (from 12:00 AM to 04:00 AM). To find her, you must go to the Olivine City Harbor. She is found right next to the SS Aqua. Talk to her and she will give you her phone number. Then, on Sunday afternoon, you can call her to arrange a rematch at the Fighting Dojo in Saffron City."
you get it after you beat Sabrina
beat blaine at cinnibar and then Giovanni at viridian city.
Beat the Kanto Gym Leaders CFS
...you beat the gym leaders
you can do about anything after you just cant beat the gym leaders again.
you get it after you beat Sabrina
After you beat Sabrina on Pokemon Leaf green and Fire red
You have to beat all 8 gym leaders
beat blaine at cinnibar and then Giovanni at viridian city.
Beat the Kanto Gym Leaders CFS
Beat all the gym leaders and Kanto leaders, then beat Elite 4 and champion.
beat the gym leaders
beat all the gym leaders to get the masterball beat all the gym leaders to get the masterball
Primarily beat the gym leaders and beat the elite four
Of course you woudn't lose your Pokemon after entering a new region. The gym leaders have stronger leveled Pokemon making them harder to beat. So the answer is definetly NO.
You just beat the gym leaders!
beat all leaders