It is found in Destral City in the hyper rank Contest halls, talk to the small girl and she will give you it
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Make sure you have a pokeblock case and go in any contest hall and look for the blenders. Press A and you can berry blend, it creates one pokeblock.
Go to your bag, go to Key Items, and then click it to open it. If you have made pokeblocks in the contest hall, you can feed one to your pokemon. If you are in the safari zone, walk up to a white platform, press A, and you will have the option of putting a pokeblock on to attract wild pokemon.
First, you need a couple of berries you wish to blend. Now, fly or take a ferry over to Lilycove city and go to the Pokemon Contest. Inside, there will be berry blending stations where you will be able to blend. (Your going to need a PokeBlock 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.
The pokeblock case in Pokemon Quartz is located in Seablue City. Seablue City can be found in the Safari Zone.