Granbull has a particularly well-developed lower jaw. The enormous fangs are heavy, causing the Pokémon to tip its head back for balance. Unless it is startled, it will not try to bite indiscriminately. It can make most any Pokémon run away simply by opening its mouth wide to reveal its big fangs. It is timid in spite of its looks. If it becomes enraged, however, it will strike with its huge fangs.
Pokédex entry #210
Granbull in Pokémon GO
It's possible to hatch Granbull from an egg?
No, Granbull can't be hatched.
Which are Granbull’s strengths and weaknesses?
Granbull is a fairy type Pokémon. fairy type pokémons are strong against fighting, bug, shadow pokémons but weak against poison, steel pokémons. They are not affected by dragon type pokémons.