Monster Kingdom: Jewel Summoner (PlayStation Portable, 2007)

And this is a rare gem that is well worth the money, I happened to slip upon it by accident when I was looking to expand my PSP collection. This game is pretty awesome, graphics, music, depth, art style are all amazing. You use element crystals to capture monsters, you can hold three monsters per character and you have a team of three characters. Typical RPG roaming random battles with story in between, with monster development that is a combination of monster rancher fusion and pokemon evolutions. Monsters are all fantasy creatures which I liked a lot, griffons, golems, kirins etc. The voice dialog is good too and so far there has been lots of it. Highly recommended for anyone interested in pokemon/monster rancher style RPG games. The only one on the PSP as far as I know, and it is great!