Magcargo’s body temperature is approximately 18,000 degrees Fahrenheit. Water is vaporized on contact. If this Pokémon is caught in the rain, the raindrops instantly turn into steam, cloaking the area in a thick fog. Its body is as hot as lava and is always billowing. Flames will occasionally burst from its shell. Its brittle shell occasionally spouts intense flames that circulate throughout its body.
Pokédex entry #219
Magcargo in Pokémon GO
It's possible to hatch Magcargo from an egg?
No, Magcargo can't be hatched.
Which are Magcargo’s strengths and weaknesses?
Magcargo is a fire and rock type Pokémon. fire type pokémons are strong against grass, ice, bug, steel, fairy pokémons but weak against fire, water, rock, dragon pokémons. rock type pokémons are strong against fire, flying, bug pokémons but weak against water, grass pokémons.