monster stone

Monster Rancher, known in Japan as Monster Farm (モンスターファーム, Monsutā Fāmu), is a Japanese media franchise and series of life simulation role-playing video games created by Tecmo (now Koei Tecmo). The series consists of fifteen games across numerous different video game platforms, and an anime adaptation that aired from 1999 to 2000.
Monster Rancher is a popular series in Japan, and it maintains a cult following elsewhere. As of 2007, the series has sold 4 million copies.