Vaporeon underwent a spontaneous mutation and grew fins and gills that allow it to live underwater. This Pokémon has the ability to freely control water. It has evolved to be suitable for an aquatic life. It can invisibly melt away into water. It prefers beautiful shores. With cells similar to water molecules, it could melt in water.
Pokédex entry #134
vaporeon in Pokémon GO
It's possible to hatch vaporeon from an egg?
No, vaporeon can't be hatched.
Which are vaporeon’s strengths and weaknesses?
vaporeon is a water type Pokémon. water type pokémons are strong against fire, ground, rock pokémons but weak against water, grass, dragon, electric pokémons.