Basically all that he says is that he has had reports of a man and a dragon type Pokemon in another region (N and either reshiram or zekrom).
After he leaves from N's Castle you don't see him again, but Looker does briefly mention him as you round up the Sages later.
An event
In Terrakions Cave after you get the other sages I found Fraxure at the bottom in the broken rock area of victory road
Looker goes away after you find the Seven Sages.
You Get it once you have Caught Reshiram/Zekrom And Beaten N. Then you will be back home and you will see Looker (Detective) But he is dressed a syour mom but he uncovers himself and he will give you it then asking you to capture the 6 remaining sages on the loose. Hope That Helped! ;)
When you finish finding the seven sages looker comes and tells you about n ps he does not give you the liberty pass
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)
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 goes back to sinnoh
you go to nuvema town to your house and talk to looker
watch Youtube videos that's how i got them
Once you have found the Seven Sages the looker will tell you that he saw N but he let him go. You can not find N in the actual game play.
He pops up out of no where and tells you news about N then leaves.
Looker appears and tells you that there was a sighting of someone riding a large black Pokemon. Then he just leaves.
you have to beat the galactic warehouse, and when/if you beat it you then go into the galactic HQ by entering from the galactic warehouse, and then Looker will come open the door.
To get the super rod you have to beat N and Looker will give it to you when he asks you to find the 7 sages.
He says he is going to a distant place to look for a legendary pokemon, but he doesn't give you anything.