Answer 1

here you go
you can look these up on youtube.

Comments

Fantastic answer.
I think Triceratops Rex should answer, he seems like a pro at Hoenn.

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whats wrong with my answer it gave the information he needs

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I was kidding, it's a fine answer :P

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oh :D thought you were being serious

Answer 2

If you get the Harbour Mail, you can go to the house next to the Pokemart in Mauville City, and give it to the lady in the house. She gives you the coin case in return.