Grimer and Muk are two of 150 different designs conceived by Game Freak's character development team and finalized by Ken Sugimori for the first generation of Pocket Monsters games Red and Green, which were localized outside of Japan as Pokémon Red and Blue.[1][2] "Betbeter" and "Betbeton" in Japanese, Nintendo decided to give the various Pokémon species "clever and descriptive names" related to their appearance or features when translating the game for western audiences as a means to make the characters more relatable to American children.[3] Grimer's name comes from the word "grime", while Muk's comes from the word "muck".[4][5]
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