you have to defeat the other seven gyms to pass to the next city next to mahogany.
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To get past you need to have: Beat Team Rocket in Mahogany (Lance found at the Lake of Rage will tell you where the entrance is) Beat Team Rocket in Goldenrod Beat the gym leader of Mahogany, Pyrce.
you definitely need help here, so go read everything on bulbapedia and serebii and psypokes, then here is the solution... mahogany town is in mahogany town!
you need to get waterfall which can be found on the ice path from mahogany town to blackthorn city. :D aydelie 101
Mahogany town
Mahogany Town