Magikarp, known in Japan as Koiking, is a Pokémon species in Nintendo and Game Freak's Pokémon franchise. Created by Ken Sugimori, Magikarp first appeared in the video games Pokémon Red and Blue and subsequent sequels. From Wikipedia
The tie-in to Netflix’s stop‑motion series centers on limited-time bonuses and research that spotlight a costumed Psyduck.