Feebas evolves when you feed it with a lot of Beauty poffins until its beauty level evolves it into Milotic.
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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.
you have to max out feebas happines and then level it up one level :DDD