This Pokémon came from the future by crossing over time. It is thought that so long as Celebi appears, a bright and shining future awaits us. It has the power to travel across time, but it is said to appear only in peaceful times. This Pokémon wanders across time. Grass and trees flourish in the forests in which it has appeared.
Pokédex entry #251
Celebi is a type grass and psychic Pokémon that doesn't evolve
Celebi in Pokémon GO
It's possible to hatch Celebi from an egg?
No, Celebi can't be hatched.
Which are Celebi’s strengths and weaknesses?
Celebi is a grass and psychic type Pokémon. grass type pokémons are strong against water, ground, rock pokémons but weak against fire, grass, poison, flying, bug, dragon pokémons. psychic type pokémons are strong against fighting, poison, ghost pokémons but weak against bug, shadow pokémons.