looker? you must have the question wrong, there is no one named looker in either B&W of pokemon (why because i named my character looker! :D)
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looker only comes when you beat the game and he gives you a Super Rod and you meet him when you find the seven sages.
He pops up out of no where and tells you news about N then leaves.
He says he is going to a distant place to look for a legendary pokemon, but he doesn't give you anything.
After you have Looker arrest the last sage out of the Seven Sages, He should thank you and he should also tell about a boy who sounds exactly like N, who has been seen with a dragon pokemon somewhere far away... ^_^
route 18