How to be Lookers Detective on Pokemon X and Y.

 You need to have beat the pokemon league before you can do this. Go to Lumiose City Station and get the Lumiose express Ticket from Professor Sycamore. Then, take the Lumiose express to Kiloude City. Next, go to the pool in Kiloude city and you will see your rival, Calem or Serena , depending on if your character is a boy or a girl. He/she will ask to battle you with his new "Partner." His/her new partner is the pokemon; Clefable. Anyways, accept the challenge. After you have defeated Calem or Serena he/she will tell you the professor is waiting at the sun dial in Anistar city. Meet up with the professor and a cut-scene happens with the professor, he talks about mega-evolution. After the cut-scene, fly to Lumiose City. You will get a Holo-Clip telling you to go to a place in an alleyway near Rogue Plaza. So go to the Prism Tower, then head towards the entrance in the tower with one old man standing in front of it and walk straight down into the alley below it. Rogue Plaza shall be through there. Go into another alley way that has a back-packer and a child standing in front of it. You will see a big black building, which is a sushi resturant, and another, which is theLooker Bureau. Obviously, go into the Looker Bureau. There is a man in there, who is Looker, and he will talk about his detective work. Eventually, he will ask you to be his detective. Accept the offer. You are now Lookers detective! Looker will ask you to do many missions throughout your detective work so be prepared for the many adventures ahead of you!