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James gives you a mission where you have to find out who stole his growlithe, he gives you his beret from Kalos and tells you to place the hat on the person you suspect did it but warns you to be sure as there is no take backs.
You naively do as he asks, are horrified with the results, you next encounter him at the Pokecenter sending Growlithe back home. He offers to become an ally but no matter what you answer he exits stage left and is never seen game again mostly because knows better than to go against Benny.