Celadon city in the diner, there's a guy eatting that you talk to who gives it to you
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You get it in the cafe in Celadon City, which is the first building on the bottom of the city where that grunt is.
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.
You buy harbor mail and give it to a girl she will give you a coin case.
go to celadon city.first go to the south of the city.the first house the is a restorant. talk to the guy in the upper table he will give you a coin case. now go in the game corner play a game or buy a coins.make sure your coin case have 1,000 coins.now go to the prize exchange and go to the left.talk to the guy and the 2nd prize there is a miracle seed.
You can "purchase" a flamethrower TM in the game corner coin-tradey place.