Thick Fat
The Pokémon is protected by a layer of thick fat, which halves the damage taken from Fire- and Ice-type moves.
Ice Body
The Pokémon gradually regains HP in snow.
Walrein's two massively developed tusks can totally shatterblocks of ice weighing 10 tons with one blow. This Pokémon'sthick coat of blubber insulates it from subzero temperatures.
Walrein swims all over in frigid seawater while crushingicebergs with its grand, imposing tusks. Its thick layer ofblubber makes enemy attacks bounce off harmlessly.
Its thick tusks are strong enough to shatter drift ice. They have been known to break, but they will grow back by the next year. The Hisui region is well known for these broken tusks.