Spoink keeps a pearl on top of its head. The pearl functions to amplify this Pokémon’s psychokinetic powers. It is therefore on a constant search for a bigger pearl. It bounces around on its tail to keep its heart pumping. It carries a pearl from Clamperl on its head. It bounces constantly, using its tail like a spring. The shock of bouncing keeps its heart beating.
Pokédex entry #325
Spoink in Pokémon GO
It's possible to hatch Spoink from an egg?
No, Spoink can't be hatched.
How many CP would Spoink have after evolving?
If you’ve catched a Spoink and you want to know how many points it would have after evolving, use this evolution calculator and find out easily. You just need to write your Bulbasaur CP and then click “Evolve”.