Pirate Island is called the Unnamed island in official pokemon series. The people and pokemon who love here love group competitions. Every week they hold a Pirate competition which is a game similar to tower defense. Places:
Pirate Center
Pokemon Center
Wild Pokemon: *Note all pokemon from gen V can be found here with RGN, but logically (example, you can't encounter wild Ice pokemon on tropical beach.) this is a list of other gen pokemon that can be found here.