Huckleberry the Houndour - The first Pokemon to apply for position of "Marshal" and to successfully win it was Huckleberry, a cheery Houndour. He's got an excellent sense of smell and hearing, and as such, is great at sniffing out criminals in town.
Nile the Vaporeon - Having come from the nearby oasis, this fellow is equipped for exploring the well underneath Gambitville. He was the second one to earn the position of helping out Jury as a Marshal.
Andy the Golurk - Totally faithful to Jury. Original description and art found here: