• English / United States: Tracey's Marill
• Japanese / Japan: ケンジのマリル
• Japanese (Romanized) / Japan: Kenji no Maril
• Japanese (TL) / Japan: Kenji's Maril

Tracey's Marill was revealed when Tracey Sketchit decided that he needed a good Pokémon to help him find the Crystal Onix. Tracey's Marill has very sensitive ears that can detect distant sounds and the round, rubbery tip of its tail can expand and contract, assisting Marill in the water. While swimming, Tracey's Marill tail floats so he can see where it's going.

Misty realized that Tracey Sketchit and his Marill make a good team as Tracey's Marill could hear a Pokémon long before Tracey Sketchit could even see it. Tracey Sketchit would often play a Pokémon cry on his dex for Marill to help it learn what the Pokémon sounded like so it could search for that particular Pokémon. Tracey's Marill ears would twitch when it was searching or it found something.