Swellow is very conscientious about the upkeep of its glossy wings. Once two Swellow are gathered, they diligently take care of cleaning each other’s wings. It dives at a steep angle as soon as it spots its prey. It catches its prey with sharp claws. If its two tail feathers are standing at attention, it is proof of good health. It soars elegantly in the sky.
Pokédex entry #277
Swellow in Pokémon GO
It's possible to hatch Swellow from an egg?
No, Swellow can't be hatched.
Which are Swellow’s strengths and weaknesses?
Swellow is a flying and normal type Pokémon. flying type pokémons are strong against grass, fighting, bug pokémons but weak against electric, rock pokémons. normal type pokémons but weak against rock pokémons. They are not affected by ghost type pokémons.