You may be looking for Ernest Greeves,a main character in Layton's Mystery Journey: Katrielle and the Millonaires' Conspiracy.
Ernest is a character appearing in Professor Layton and the Unwound Future. He, like other residents of Midland Road, is a great friend of Cogg as he not only makes frequent visits to the Clock Shop but has been with Cogg for a few years helping him in the area. He is found on Midland Road some time in the middle of the game. This is usually after Professor Layton and Luke return to the future after finding some invaluable information at Scotland Yard. He is somewhat short and timid and seems quite old. He has a fine love for antiquities as well. Ernest lost his key to his home and is in desperate need of assistance. Luckily for him, Layton and co. Ernest. They help him make a new key from a few blocks, and after the key is made he then leaves, never to be seen again. Ernest wears a hat and has a white mustache and is found in the bushes by the abandoned shop where Beasly and his flower are.