In veilstone go talk to everyone I think someone in a house has it and they let you have it but I haven't played in years so sorry if I'm wrong I think that's right. By the way I don't think you can use the coin case to gamble because I asked a friend why I couldn't play and they said the gambling has been stopped because little ones have this game and it is sending a bad message sorry if I'm wrong good luck on your game hoped this helped! :)
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play the pokeslots
In Veilstone City, the house to the left of the game corner (on the other ledge) there is a clown. When you talk to him he will tell you to pick a hand. No matter which one you choose, you will receive the coin case. You must choice the left hand or you get nothing!
I can trade you one if you want.
You buy harbor mail and give it to a girl she will give you a coin case.
Press L+R 94000130 FCFF0000 62101D40 00000000 B2101D40 00000000 1000009C 0000C350 D2000000 00000000