Does taking pictures in all his locations give you a reward or an item? Also does he have any other use in the game?
No, he does not reward you with anything. His only use is photos. Use this site for info: http://bulbapedia.bulbagarden.net/wiki/Photography#Pok.C3.A9mon_HeartGold_and_SoulSilver .
Hope this helps:)
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