You make pokeblocks. First you must have berries in your bag. You go to a Pokemon contest area and you will see a machine called a pokeblock machine. Go to the machine and you play a game in which you have to click on the arrow that spins. The more you hit it, the more faster the pokeblock is made. You feed pokeblocks to your Pokemon to increase happiness and help with contests.
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Liteblue pokeblock..
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.
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.
there isn't a white pokeblock
It depends on its nature, or just give what color it is. A brown pokeblock would do