Raikou embodies the speed of lightning. The roars of this Pokémon send shock waves shuddering through the air and shake the ground as if lightning bolts had come crashing down. This rough Pokémon stores energy inside its body, then sweeps across the land, shooting off electricity. The rain clouds it carries let it fire thunderbolts at will. They say that it descended with lightning.
Pokédex entry #243
Raikou is a type electric Pokémon that doesn't evolve
Raikou in Pokémon GO
It's possible to hatch Raikou from an egg?
No, Raikou can't be hatched.
Which are Raikou’s strengths and weaknesses?
Raikou is a electric type Pokémon. electric type pokémons are strong against water, flying pokémons but weak against electric, grass, dragon pokémons. They are not affected by ground type pokémons.