Walrein’s two massively developed tusks can totally shatter blocks of ice weighing ten tons with one blow. This Pokémon’s thick coat of blubber insulates it from subzero temperatures.
– Pokemon Ruby Pokedex
Walrein is a very useful Pokemon on a Hail team, due to its ability Ice Body, which recovers HP in Hail. If it is holding Leftovers and has Ice Body, alternating Substitute and Protect would not lose any HP, so it’s useful for stalling (while waiting for poison to drain the opponent’s HP for example). Because it’s also part Water, it’s not weak to Fire, and can counter Fire types and Rock types.
It’s based on a walrus obviously. The white “hair” on its face and behind its head reminds me of a judge’s hair and beard.
Stat-wise, it has lots of HP, good Sp Attack, decent defenses, though it has too many type weaknesses, but is rather slow.