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Dawn is a 10-year-old Pokemon trainer and Coordinator that travels with Ash and Brock and replaces May during Pokemon: Diamond & Pearl. Following in her mother's footsteps as a coordinator, she chooses a Piplup, which she had already befriended at an earlier point, and sets out with the goal of winning the Grand Festival. As a native of Sinnoh, she often explains certain aspects of the region unfamiliar to both Ash and Brock, and keeps up to date with popular trends.

Source from Wikipeida