Dugtrio are actually triplets that emerged from one body. As a result, each triplet thinks exactly like the other two triplets. They work cooperatively to burrow endlessly. Extremely powerful, they can dig through even the hardest ground to a depth of over 60 miles. In battle, it digs through the ground and strikes the unsuspecting foe from an unexpected direction.
Pokédex entry #51
dugtrio in Pokémon GO
It's possible to hatch dugtrio from an egg?
No, dugtrio can't be hatched.
Which are dugtrio’s strengths and weaknesses?
dugtrio is a ground type Pokémon. ground type pokémons are strong against fire, electric, poison, rock, steel pokémons but weak against grass, bug pokémons. They are not affected by flying type pokémons.