It lives at the bottom of clear lakes. In times of war, it shows itself, which soothes people’s minds and hearts. Milotic is said to be the most beautiful of all the Pokémon. It has the power to becalm such emotions as anger and hostility to quell bitter feuding. It is the world’s most beautiful Pokémon. There are many works of art featuring Milotic.
Pokédex entry #350
Milotic in Pokémon GO
It's possible to hatch Milotic from an egg?
No, Milotic can't be hatched.