have a question

[GOMIN ADAM]

my question is were do u get the coin case in sapphire

[mvrckbass]

1. You have to buy some Harbor mail in Slateport city.
2. Travel north to Mauville Town.
3. On the road connecting Mauville Town and Slateport city, there is a house with a girl. Talk to the girl with 1 harbor mail in your bag and she'll ask to trade you the mail for a coin case.