You don't until you beat the 7 other gyms. After that fly back to Viridian city and the leader will have returned
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You beat the TRAINERS first then the doors unlock and you can go through them ^^
Pewter City
Once you beat the other seven gyms, the final one will unlock. This is the same for Pokemon Red, Blue, Yellow [including the Special Edition] and Pokemon Red/Green.
Hit random trash cans until you win.Edit: The trainers will give you the clue of the 2nd switch is next to the first. However this can mean in any direction.
You must unlock the mystery gift. To unlock the mystery you must go to Jubilife City and talk to a reporter in the 2nd or 3rd floor of it. Answer "Everyone happy" then he will ask another question and answer "Wi-Fi Connection." however this will not unlock the green man. In order to unlock him you must have WFC. You must unlock the mystery gift. To unlock the mystery you must go to Jubilife City and talk to a reporter in the 2nd or 3rd floor of it. Answer "Everyone happy" then he will ask another question and answer "Wi-Fi Connection." however this will not unlock the green man. In order to unlock him you must have WFC.