It doesn't like the kind you are trying to feed it, or it is full, or your game had a glitch, or your lying about this.
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This happens. If you gave your pokemon alot of pokeblocks, it will not eat anymore. Which means; It's done forever. You will never be able to give your pokemon a pokeblock.
where do u find ganlon berry? the reson y i need to find it because i want to evolve feebas but the pokeblocks i give it wont max its beauty and it says that it cant eat any more
It depends. See the "Feel" stat of the pokemblock? The higher that is, the less the Pokemon will be able to eat.
Pokemon can only have a set number of pokeblocks. Once they have eaten that set number, they will never be able to eat any more. The only way that you can get your pokemon all the way to the highest amount of a skill is to make really good pokeblocks.
There is a limit to how many PokeBlocks a certain Pokemon can eat before you can't give it any more, so use PokeBlocks wisely.