Regice cloaks itself with frigid air of -328 degrees Fahrenheit. Things will freeze solid just by going near this Pokémon. Its icy body is so cold, it will not melt even if it is immersed in magma. Its body is made of ice from the ice age. It controls frigid air of -328 degrees Fahrenheit. It is said to have slept in a glacier for thousands of years. Its body can’t be melted, even by magma.
Pokédex entry #378
Regice is a type ice Pokémon that doesn't evolve
Regice in Pokémon GO
It's possible to hatch Regice from an egg?
No, Regice can't be hatched.