Speeding up the Process of Happiness based evolution and Increasing Beauty
Everyday, Daisy Oak gives out massages from 3 PM to 4 PM, that increases the Pokemon's happiness, at the Oak house in Kanto.
Big Brother gives out haircuts on Tuesday, Thursday, and Saturday in the Underground Market in Goldenrod.
Little Brother gives out haircuts on Sunday, Wednesday, and Friday in the Underground Market in Goldenrod.
There is an extra bonus of getting these haircuts and massages besides happiness. Its Beauty condition will increase by 32. It only takes eight days to reach the max amount. You can manipulate the time to max this out in a couple minutes. This is an easy way to evolve Feebas.