Beat team rocket at mt moon, Pokemon tower, game corner and silph co and get the 7th badge now you can fight the last gym leader.
the boulder badge from brock
viridian city
fuschia.
Fuschia city.
fap
In Vermilion city.
Head to Cinnibar Island for your next badge.
vermillon city
Vermilion city.
In cerulean cities gym you must beat the leader misty to get the cascade badge.
in Viridian city. the one that was locked.
Fight Misty laduh