Monster Rancher 4

Monster Rancher 4 (known in Japan as ) is a monster breeding and management game that was released by Tecmo for the PlayStation 2 in 2003.
Gameplay.
Like the previous installments, this game involves the raising, breeding, and fighting of monsters. Monsters are created via a "Saucer Stone" regeneration system. Players must go to a Shrine, where they swap the Monster Rancher 4 disc with a CD, DVD, or another game disc. A monster is then generated from the data contained on that disc. Once a player regenerates a monster, they can raise it on a ranch, and train it to compete in battles. The limit for monsters depend on the size of their ranch but the maximum is 5 monsters.
Reception.
The game received "generally favorable reviews" according to the review aggregation website Metacritic.
IGN ranked it as the 88th best PlayStation 2 game. The staff praised its improvements over its predecessors.