Misty's Clauncher first appeared when Satoshi tried to catch it after getting into a heated battle with it alongside
Ash's Corphish.
Misty had revealed she had been trying to catch this Clauncher for a while, but ultimately failing everytime. After battling to determine who would catch it, Misty won, and rightfully got to keep it.
On page 44 of Otomedia (Spring 2023), it was confirmed that Yūji Ueda was its seiyuu.