Use berries that have dry and sour circled in red to see this go to a berry in your bag Press A on it then Press A on CHECK TAG you will see the berries taste and feel use berries that are on the lower part of the list there better and blend with the four people in the lilycove city contest hall.
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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.
Pokeblock's are not in diamond instead there called poffin's, just like ruby, sapphire and emerald in the Pokemon contests you can create your own poffin using berries.
If you are playing on emerald, you can interact with any of the tables the npcs are sitting at to make a pokeblock!
Go to a Contest Hall like the one in Verdanturf Town and (first u need a pokeblock case; can be found in Verdanturf Contest Hall) and talk to the old man and he will let you make a pokeblock
you can't but you can make poffins Poffins in diamond and pearl replace what used to be pokeblock.