i think it is level 47! just a guess no it is actually level 43 you just have to maximize his beauty .
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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