Monster Rancher is a series of games (there’s also an anime) in which you (at certain prompts) insert another cd, dvd, or game disc into your machine to generate a monster which you then take back to your ranch to train for battle.
I’m reviewing Monster Rancher EVO today because it stands out the most for its story and characters, although its gameplay deviates significantly from any of the other games in the Monster Rancher world. I recommend this game, but I also would recommend any of the other Monster Rancher games as well. I’ve played them all (with the exception of the hand held ones). It is truly a great monster taming series.