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Jack is a recurring character in the Pokémon anime. To date, he has appeared in eight episodes: The Champ Twins!, All Dressed up With Somewhere to Go!, A Secret Sphere of Influence, Top-Down Training, Mass Hip-Po-Sis!, Our Cup Runneth Over!, Pursuing a Lofty Goal!, and Beating the Bustle and Hustle!. He was not given a name in the Japanese version.
He is a member of Rhonda's Sinnoh Now crew and accompanies her to various assignments. He handles the microphone boom and often drops the boom onto Rhonda's head, which has become a running gag within the series. The reason behind him doing that was not explained, however, though it appears he always does so on accident since he is quick to apologize. However, in Pursuing a Lofty Goal!, Jack fell asleep, which led him to lose his grip on the boom mike. In Beating the Bustle and Hustle!, he dropped it on Jessie's head, and Rhonda threatened to fire him.
Jack's name may come from the TRS connector, also known as the jack.