If you mean Claire in Blackthorn City, you must go through the Ice Path east of Mahogany. If the man is still in the way and won't let you pass go to Goldenrod City again.
Chat with our AI personalities
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
beat the 8th gym
Brock.
defeat all the other gym leaders
in blackthorn city