In order for the man in Mahogany Town to let you pass so that you can go to Route 44 which leads to the Ice Cave and then to Blackthorn City, you must first defeat Pryce (the Mahogany Town Gym Leader) and you also have to defeat Team Rocket in Goldenrod City who will be taking over the Radio Tower. To get past the man guarding the stairs. You will need to go to the goldenrod underground (north) and talk the the team rocket grunt and he will give you a uniform.
By the way if you have Pokemon pearl, diamond or platnium and don't play them as much transfer your top six(party)pokemon start a new game and keep doing that because then you can have chimchar,turtwig and piplup.
P.S I would suggest either piplup or chimchar.But if you think you will be doing a lot of Surfing,whirlpooling,waterfalling or fishing pick turtwig.P.S.S chimchar has the best attack,turtwig the best defence and piplup the best health.
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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.
You need to beat Team Rocket then Beat the gym leader and he'll go away
you have to have beat the other 6 gyms. mahogany is the 7th.
get all the kanto and jhoto gym bages,then go to proffesser oak in pallet town,hell give u the pass to mt.sliver if talk to him
Talk to the old man as soon as you walk into CherryGrove City, and let him take you on a tour of the town.