Rapidash usually can be seen casually cantering in the fields and plains. However, when this Pokémon turns serious, its fiery manes flare and blaze as it gallops its way up to 150 mph. It gallops at nearly 150 mph. With its mane blazing ferociously, it races as if it were an arrow. Very competitive, this Pokémon will chase anything that moves fast in the hopes of racing it.
Pokédex entry #78
rapidash in Pokémon GO
It's possible to hatch rapidash from an egg?
No, rapidash can't be hatched.
Which are rapidash’s strengths and weaknesses?
rapidash is a fire type Pokémon. fire type pokémons are strong against grass, ice, bug, steel, fairy pokémons but weak against fire, water, rock, dragon pokémons.