You can feed any amount of poffins until all of their status (cool, beauty, strength, cute, smart) is at the highest level.
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when a Pokemon eats poffins, its sheen increases. When its sheen is full the Pokemon will eat no more poffins. around about 10 - 15 is the maximum i think
they wont eat anymore poffins that's all sorry
You can't!
feed it carbos and sutff
probably what another day or so{i am not sured but i have the game}