One Piece: Dragon Dream!

One Piece: Dragon Dream is a Japanese action board game for the Game Boy Advance console featuring characters from the popular anime and manga series One Piece. This game is a sequel to the Playstation game One Piece Ocean's Dream. The games had also been made into a filler arc called the Ocean's Dream arc, which has a similar storyline as the games. The game was developed and released in April 28th, 2005 by Bandai.

One night, when the Straw Hat Pirates are asleep in their beds except for Robin, they all dream of a cloaked young boy underwater playing music from a sea horn. In the morning, when Robin wakes her crewmates up, she is shocked to discover that they have no memories of her or them being in a pirate crew. With the memories from before joining the crew still in their heads the crew begins to split up.

Now it is up to Robin to not only reunite the crew and help get their memories back, but also find out the cause of their mysterious memory loss.

There are many characters in the game. These are the ones which you can battle against and use.