Jack Walker
From Bulbapedia, the community-driven Pokémon encyclopedia.
Jack Walker (aka Jackie) is the blonde Pokemon Ranger who is the main hero of the film (other than Satoshi-tachi, of course). Jackie joins our heroes in the middle of a top-secret mission that sees him delivering a pokemon egg to the Water Temple Akuusha. This egg, which belongs to the Prince of the Sea, Manaphy, is said to unlock the secrets of the water temple's treasure.
Like other Pokemon Rangers, Jackie is able to use his Capture Styler to "capture" pokemon by temporarily controlling their abilities. In the Pokemon Ranger game, Pokemon Rangers use pokemon to perform tasks such as clearing roadblocks, putting out fires, and crossing rivers.