Through Primal Reversion and with nature’s full power, it will take back its true form. It can cause magma to erupt and expand the landmass of the world. This legendary Pokémon is said to represent the land. It went to sleep after dueling Kyogre. Said to have expanded the lands by evaporating water with raging heat. It battled titanically with Kyogre.
Pokédex entry #383
Groudon is a type ground Pokémon that doesn't evolve
Groudon in Pokémon GO
It's possible to hatch Groudon from an egg?
No, Groudon can't be hatched.
Which are Groudon’s strengths and weaknesses?
Groudon 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.