Rasing Beauty to evolve Feebas
The easiest way is to feed it level 45 pokeblocks will help.
Belue, Spelon, Durin, Watmel, Pamtre are the blocks that produce a good level 50 pokeblock, One of them is the right one.
Feed him/her 4 which will make it enough.
Evolving Feebas - 170 Beauty Maxed
Be sure to breed more in case it doesn't work.