hi.
I have shiny Feebas LV 1.
I feed it with dry (beauty) pofins, until I reached the end.
It doesn't wanna to eat any more, because it has all the stars.
He not evolution!
What to do?
A Feebas evolves when it levels up when it's Beauty is maxed out. If you gave it dry poffins until it got full, and it's not leveling up, than it's Bueaty didn't raise enough.
Sorry, but your Feebas will never evolve. =(