well you can do it with cheats or by yourself
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Y
It's in a building in goldenrod city.
You can't use poffins in this game
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.
Receive from Mr. Game at the Goldenrod Game Corner.