He isn't there. I already searched the entire city 10 times.
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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.
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)
You get the black flute when you reach the smashed wall and Looker gives you it.
In poke platinum you get a black poke flute from Looker the agent
He pops up out of no where and tells you news about N then leaves.