what is the best RPG game on PSP?

Kingdom Hearts Birth by Sleep. Its an action RPG created by Square Enix and Disney... or if you dont like action Rpgs, I recommend valkyrie Profile: Lenneth to you. See it on yourube, you'll gonna like BOTH of the games.

I think the best psp rpg game of all time would have to be Jean d arc even though I got stuck on the last boss and have to start all over.

For me the best is final fantasy or god of war.

you should try god of war, prince of persia, tomb raider anniversary, rachet and clank, daxter, resistance:retribution etc. this are just some few of the rpg that i've tried

I could go on for awhile about this one. It really depends on what kind of format you like? do you like lots of side quests and good story lines, weapon creation, tactics, turn-based and so on. the best thing is to go to a trailer site like gametrailers and check some of the gameplay and stories out. my favorite is "Untold Legends Warrior's Code" or maybe "Brave Story". their are really some good ones and everyone is gonna have their veiw on what makes which RPG better then another one.

I would say that crisis core is a really good rpg game and it has one of the best storylines in my opinion. Another good game is Jean'de Arc. It's a strategy game too so if your not into that stuff well I wouldn't recommend it. But it really does have a good storyline and I love the graphics..plus it takes you a while to finish so that's good.

for me i prefer to you the "YS SEVEN" i really love this psp games. it have a great graphics and also i love the gameplay. i it most likely an online games. i really love this games

I would recommend Metal Gear Solid: Peacewalker. It doesn't only cover the stealth action aspect of the genre, but also has a base management aspect (making it an rpg, well sort of). For kicks, you can also try the classics: Final Fantasy I & II. Though these are quite old games, the story and gameplay will keep you hooked for hours. I just wished Dragon Quest was ported over to PSP....