You cant.You get the apricorn box from some guy at the beginning of the game then the apriblender at the pokeathelon dome.the pokemon web site said you can but . . . . i have not found one
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In Pokemon Ruby,Sapphire and Emerald after you make a pokeblock, you can check the pokeblock case and you give the desired Pokemon the pokeblock to help it do better in Pokemon contests. After you have received a pokeblock case and you made pokeblock at the berry blending machine go to your key items in your bag and scroll down to your pokeblock case then simply select the pokeblock you want to give your Pokemon.
The pokeblock case in Pokemon Quartz is located in Seablue City. Seablue City can be found in the Safari Zone.
Mix one out of berries. It will be in your pokeblock case. Feed it to the Pokemon that you want to give the pokeblock to.
in order to get the pokeblock case, you have to go to the Pokemon contest in lilicove.After that, talk to the girl on the upper, upper, left with blue hair.talk to the one on the left.then she will give you a pokeblock case.thank you for reading.hope it helped =]
you can get yourself a pokéblock case at the lilycove contest hall.