Pokemon Ranger: Batonnage
This game is titled Pokemon Ranger: Shadows Of Almia in North America, Europe, and Australia, and Pokemon Ranger: Batonnage in Japan.
Successfully complete the main storyline. You can now ride Wailord from Haruba Village to reach the Capture Arena.
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Fight Darkri again
After completing the game, go back to the top of Alturi tower. At the top, there is a man. Speak to him and you can fight Darkri again. However, once you have fought him you will lose all your Pokemon.
Strategy guides from GameFAQs