Wobbuffet does nothing but endure attacks—it won’t attack on its own. However, it won’t endure an attack on its tail. When that happens, the Pokémon will try to take the foe with it using Destiny Bond. To keep its pitch-black tail hidden, it lives quietly in the darkness. It is never first to attack. It hates light and shock. If attacked, it inflates its body to build up its counterstrike.
Pokédex entry #202
Wobbuffet in Pokémon GO
It's possible to hatch Wobbuffet from an egg?
Yes, Wobbuffet it's a Pokémon that can be hatched from an egg. Wobbuffet can be hatched from a 5km egg.