Exeggutor originally came from the tropics. Its heads steadily grow larger from exposure to strong sunlight. It is said that when the heads fall off, they group together to form Exeggcute. It is called “The Walking Jungle.” If a head grows too big, it falls off and becomes an Exeggcute. Its three heads think independently. However, they are friendly and never appear to squabble.
Pokédex entry #103
exeggutor in Pokémon GO
It's possible to hatch exeggutor from an egg?
No, exeggutor can't be hatched.
Which are exeggutor’s strengths and weaknesses?
exeggutor is a grass and psychic type Pokémon. grass type pokémons are strong against water, ground, rock pokémons but weak against fire, grass, poison, flying, bug, dragon pokémons. psychic type pokémons are strong against fighting, poison, ghost pokémons but weak against bug, shadow pokémons.