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Trevor the dex maniac, he has the same team with better movepool, he challenges you more often and he does it when you enter in zones were are rare pokemon, once you defeat him he compares dexes with you and he always wins (just text shit), he shows you a dex entry of the rarest pokemon in the zone he currently is.
After you beat the league you can find him in the lab in Lumiose assisting Sycamore, you can challenge him once per day, and as a reward he helps you with the national dex showing you a random dex entry that you dont have.
Once you complete the dex, he shows you a blurry photo of a rare pokemon that he cant recognize yet, its a pokemon he battled when he challenged a tourist, that pokemon is from the next generation, and it could be any shill mon of gen 7 like rockruff.
