Huntail’s tail is shaped like a fish. It uses the tail to attract prey, then swallows the prey whole with its large, gaping mouth. This Pokémon swims by wiggling its slender body like a snake. It lives deep in the sea. With a tail shaped like a small fish, it attracts unsuspecting prey. It lives deep in the sea where no light ever filters down. It lights up its small fishlike tail to attract prey.
Pokédex entry #367
Huntail in Pokémon GO
It's possible to hatch Huntail from an egg?
No, Huntail can't be hatched.