i dont know where to find it but you can buy it at slateport city`s mart
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You can find an harbor mail in Slateport City Hope I Helped By Matthew Teves
just keep walking and u will find it. :p
To get the coin case, you go to mauville city and go to the house to the east of the game corner. in that house theres a girl. talk to her and she'll say something about harbor mail. go to slateport and buy some and then come back to mauville.then for the harbor mail,she'll give you a coin case.
yes in slateport town pokemart or in the trick master house one of the levels you can find it
In the game Pokemon ruby destiny