Arctovish is a fish-plesiosaur hybrid fossil Pokémon. The plesiosaur half is colored blue and white. It has a blue tail with a fin on top. The flippers are colored blue with white patches on the end and with white spots. The fish half is applied upside down. It has a round blue head with black rectangle pupils, and the mouth is located on top of its head. It has white fins connected to its fish head.
It has trouble eating due to its mouth being on top of its head, even though it captures prey by freezing its surroundings. And while the skin on Arctovish's face is impervious to attacks, it went extinct due to breathing difficulties.
In the anime
In the manga
In the TCG
This Pokémon was unavailable prior to Generation VIII.
The Pokédex entries for all the Galar Fossils mention them being the cause of their own extinction, which may be a reference to the outdated hypothesis that the dinosaurs were evolutionary inert, which made them get bigger, sluggish and stupider to the point they couldn't sustain themselves.
Arctovish may be a combination of arctic, fish, and possibly vicious.
Uochirudon may be a combination of 魚 uo (fish), chill, and -don (common suffix in dinosaur names derived from the Ancient Greek word for tooth).