Where do you find all seven sages?

Okay here is a list of places your can find the sages.
Cold Storage in the crate, Relic Castle right before you battle Volcarona, Route 18, there is one in the Dream Yard, another one can be found deep in Chargestone Cave, Route 14 above the waterfall. I think thats where they all are. I hope this helps.

Alright, I'm going to tell you where the seven sages are and how to get to them.

To get to the first sage, you need to use surf. And he could be found on route 17 whick is the closest to route 1. Explore route 1 until you see a tiny flight of stair leading to the ocean. Use surf and go left until you see land. Go on that land and go left. You should see a Pokemon ranger once you go left. Then keep on traveling down until you see one of those buidings which separate cities and routes. Go inside and the eletrical bullentin board should be broken. Go out and you will end up on Route 17. You should see the sea once you get out of the building. Surf on that seaa and you will see a bunch of trainers and white islands. Go north west then go down and you would see a bunch of currents. Take the current the most south and it should go left without turning you. You will be thown into the water close to an island. Go on that island then go up the stairs. Keep on going in that one way direction until you hit a place with a house (You could enter that house to get the Pokemon Larvesta). There will be three ways a path, a bridge, and a flight of staires. Go to the flight of stairs and go down. Keep going south and you will find a sage.
Now I will tell you how you get to the second sage.
Go to the cold storage at driftveil city and go into the crate where you found a dozen of team plasma dudes in the past. A sage should be there.
The next one is in the relic castle. You know, the ancient ruins in the desert resort. You can get there on your way to Nimbasa city. Enter the relic castle (Use the entrance with the weird Darmanatan statues). Once you entered, go left and you will see two quicksand pits. Go past the first one then the second one and try not to sink inside. A way to get past it easily is to walk. Don't run or use a bike. After you get pass those two quicksand pits then go down the stairs. After you go down the stairs, you will enter a room with only a quicksand pit. Go inside that one. Go up the left, dodge the quicksand pit then go down. Don't go up the stairs or jump over the wall. Go down and sink into the quicksand pit. You'll end up in a corner with two ways to go. Go left but don't sink in that sand pit. STOP! At the sand pit I told you not to sink in. There will be three paths. Chose the one that has a very close sand pit almost right beside the one you're standing on. Sink in that sand pit. You'll end up in a very small place. DON'T jump over the wall. Instead, sink in the sand pit right beside you! You'll end up in a weird place. Don't go up the stairs but go up the hill and you will see some sort of entrance. Enter it! When you enter you will see a team plasma dude who sayes PLASMAAAAAAAAAA and beats you up with a plasma ray. Just kidding! But he does say PLASMAAAA! And he runs off. Enter the next entrance and he will run to you and battle you. He has a KrooKodile level 64 (the first time I battle him was just after the elite four so when I saw a level 64 I was like "HOLY COW"). After you beat him he will tell you that one of the seven sages is in this place and he is searching for a certain Pokemon. After he finishes talking then go pass him and enter the entrance to the right. Keep on going right until you see a flight of stairs. After you see it then go back to the room before you saw the flight of staires and go to the bottom entrance. Then go to the right entrance. Then the bottom again. Then the right again. Go right one more time and you will see the sage. After you talk to him enter the room he was looking at and you will see a Volcarona level 70.
The next destination is the dreamyard. Keep on going left when you enter untill you find the last fence whick is opened. Go inside and go to the right, you will see that there is a space between the barrel and the wall. (There used to be cones blocking the space but now that you beat the elite four. They're gone. Pass the barrel and keep going until you find a flight of stairs whick you enter. When you enter it, you will go underground. You'll fight a lot of trainer battles and finally you will find a flight of stairs in the end. Go up then you will appear outside. Go forward and the sage will run to you and try to scare you.
The next sage will be close to black city. Go there and go up to the building which splits routes and cities and get out. Go right pass the ace trainer then go into the tall grass (dark green) use surf on the water then use waterfall to ascend the waterfall. Now you might be wondering where you could find the HM waterfall. Well you know the sage on route 17 I mentioned earlier? Well it's very close to him. It's on the land beside him to the left (climb the stairs first). After you use waterfall, you will see the next sage! Ther next one is in charge stone cave. It's way to hard for me to describe where he is so I'll just give you a link! http://youtu.be/tKew9hV0pHM
Hoped this helped!!!