One of the few spinoff Pokemon games that is actually worth playing. Rescue the caterpie, and experience a great game.
I found the plot to be very interesting. You wake up one day and find that you're a pokemon with no memory of being a human, but think you were. I have often imagined what it would be like if I was a pokemon many times as a kid. Though I'd rather Pokemon just be real instead.
Anyway, it would take very long to tell how many things make this game different. All the side-concepts take long to get used to. But you'll get used to it. I really liked the test at the beginning that tells you what you're like, and what Pokemon you'd be. I'm a Charmander, and I love it.
This game has an interesting and well developed story to go with the plot. The ending made me cry and there was never a time when you didn't have enough motivation to keep going. Except when the dungeons start to become boringly hard. You can die without much warning easily. And leveling up is unbearably long to do.
Extra Comments: This game has many flaws that may seem unfair, but overall it's a good game. Definitely worth playing for all Pokemon fans.