Mismagius have been known to cast spells to make people fall in love, so some people search for this Pokémon as if their life depended on it. It chants incantations. While they usually torment targets, some chants bring happiness. Its cries sound like incantations to torment the foe. It appears where you least expect it.
Pokédex entry #429
Mismagius in Pokémon GO
It's possible to hatch Mismagius from an egg?
No, Mismagius can't be hatched.
Which are Mismagius’s strengths and weaknesses?
Mismagius is a ghost type Pokémon. ghost type pokémons but weak against psychic pokémons.