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I'll Just List Them all Since I don't Know which One You Found. ((Copied From Serebii.net because Even I don't have them Memorized DX))

Route 18 - Sage Rood

The first sage geographically is Rood. Rood is found within Route 18, right at the end. Talking with him, he'll give you some backstory into Team Plasma as Looker appears and takes him away. He will also give you TM32.


Dreamyard - Sage Gorm

Geographically, the next sage you'll find is in the Dreamyard. After you have battled through the trainers in the basement of the lot, you'll find Gorm. Like Rood, he'll tell you some more of how Team Plasma was formed and will give you TM75. Looker will soon appear and will arrest Gorm as well.


Relic Castle - Sage Ryoku

In the Relic Castle, a new area will have opened up. This area will take you to the new basement which contains a maze. Follow the maze through, and you'll find a Team Plasma grunt who quickly flees. Continue on and you'll find Ryoku in front of a doorway. Speak to him and you'll get even more backstory, TM04 and Looker will appear to arrest him


Cold Storage - Sage Zinzolin

In the container inside the Cold Storage, you'll find that the sage Zinzolin has taken up residence in isolation due to what he has done. Once more, you'll get some backstory into Team Plasma and Ghetsis. He will give you TM01 before he is taken away by Looker.


Chargestone Cave - Sage Bronius

Next, hidden well within the basement of the Chargestone Cave, you'll find the sage, Bronius. However, before you can properly talk with him, two Plasma Grunts come in to protect him and challenge you to a battle. Defeat them and Bronius will talk like the others to give Looker the information he needs. He'll give you TM69.


Route 14 - Sage Giallo

Finally, the next sage is in Route 14. You need both Surf and Waterfall in order to reach him. Once you reach him, he'll give you the final piece to the Team Plasma backstory and Looker will come and arrest him, thanking you for your assistance. He wil give you TM08 before being taken away.