You get it in the cafe in Celadon City, which is the first building on the bottom of the city where that grunt is.
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In Celadon City go down from the Pokemon Center until you see three buildings you can enter. Go inside the far right one and you should be inside a Cafeteria go speak to the man in the upper left corner and he will give you his Coin Case.
In Pokemon Yellow, you can obtain the coin case from a man sitting at a table in the cafe in Celadon City. The purpose of the case is to hold coins for use at the Game Corner. In Pokemon Yellow, the Coin Case can hold up to 9,999 coins.
Celadon city in the diner, there's a guy eatting that you talk to who gives it to you
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
You get the coin case in the house next to the game center in mauvile town.The lady will give you it.