Unless it has max beauty you can't. You'll need to catch another one and try again.
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It means that he/she ate to many. If your trying to evolve it, i used a trick. If you have one and you feed it to many, breed w/ ditto. If you want to check if its ready to evolve, go to the scarf guy/ chairman of Pokemon club.
feed it dry poffins. but make sure the poffins are levels 30 or so or it wont work. when it wont eat any more level it up. if it doesnt evolve then the poffins were too weak
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
they wont eat anymore poffins that's all sorry
probably what another day or so{i am not sured but i have the game}