get some berries that levels up beauty then after you kept giving it to feebas then it will evolve but to make it evolve after giving alot of beauty berries you can either use rare candies or fight wild Pokemon with feebas.
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LOL Beauty Berries.
Here:http://bulbapedia.bulbagarden.net/wiki/Feebas_(Pokemon)
tobyunkown
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you have to max out feebas happines and then level it up one level :DDD
Anyway, to evolve Feebas into Milotic, your Feebas has to have its max beauty, then after that level it up by 1. And then Feebas will evolve into Milotic.
Feebas will only evolve with high beauty.
Feebas does not evolve by level in Pokemon HeartGold. Feebas evolves when it levels up while it has a maximized beauty condition.
To evolve feebas, you have to max out it's beauty, by feeding it a lot of pokeblocks that promote beauty.