The third installment in the action-packed Pokémon Ranger series lets players take on the role of a Pokémon Ranger tasked with protecting Pokémon; people and nature in the Oblivia region. As a Pokémon Ranger; players investigate the nefarious actions of the Pokémon Pinchers who have been disrupting the peace by chasing and catching Pokémon.
- As a Pokémon Ranger players set out to stop the Pokémon Pinchers with the help of their partner Ukulele Pichu (an energetic Pichu that always carries a ukulele).
- Players use the Capture Styler to circle Pokémon on the touch screen. The further in the story players progress the more powers and abilities their Capture Styler gains.
- By drawing special Ranger Signs on the touch screen players can summon powerful Pokémon that they have befriended to help them progress in the game. Legendary Pokémon like Raikou Entei and Suicune can be summoned by drawing their Ranger Signs.
- Up to four players can play together on certain missions using the Nintendo DS Local Wireless Connection and discover more about the history of the Oblivia region.