Monster Rancher DS, known as Monster Farm DS 2: Yomigaeru! Master Breeder Densetsu in Japan, is a Life Simulation video game developed by Cing and published by UFO Interactive Games for the Nintendo DS. It was released in Japan on August 7, 2008 and in North America on August 3, 2010.
The game, taking place in the BOMBA region, involves raising, fighting, and breeding monsters. The main character is never seen on screen, but always talks to his apprentice, Cleo, directly. The player chooses his actions and choices through menu options.
Source: Wikipedia, "Monster Rancher DS", available under the CC-BY-SA License.