When Team Galactic is trying to capture Diagla where are they trying to..

It would be helpful to us if you tell us where you are in the game. Anyway, obtain 7 badges and visit the 3 lakes and then go to their HQ in Veilstone City, and release the 3 pokemon. From there, go to the top of Mt. Coronet and that's where they're reviving and capturing Dialga. On the top of Mt. Coronet, that is, otherwise known as Spear Pillar.

1. Go to Oreburgh, then up the mud and head east, past the Campers and Hiker, then into Mt. Coronet.
2. Go all the way up the path until you come to water, which you now must surf on.
3. Head east until you come to a spot where you are able to use Rock Climb(obtained North of the Hiker's house on Route 217).
4. Proceed up the stairs and head north until you see three ledges, now go west until you get to a path that leads south.
5. Go south from this point, and pick up the Revive at the end of the path, then go up the stairs.
6. Head north, then west across the bridge.
7. Go down the stairs to the south, then up the stairs to the north, then up more stairs east of those.
8. Head east across the bridge, then go down the stairs, making sure not to go down the ledges.
9. Continue west and go down the stairs, under the bridge, then up the stairs to the north-west.
10. Keep going until you find a hole, go through it.
11. Go up the stairs, then up more stairs to the north-east.
12. Head north, up the stairs, then west, at the end, continue south(if you can, try and avoid the Galactic Grunts), exit through the hole.
13. You should be outside now, proceed east, up the stairs(so as to avoid unwanted interference by wild Pokemon), keep going east, then head north until you reach some stairs, climb down.
14. There should be a spot to use Rock Climb nearby. Find the spot and proceed to climb.
15. Head west(do not rock climb on the next spot).
16. You are now presented a choice; take the grassy route and risk being damaged by high-leveled Bronzong and Abomasnow, or take the southern route, which requires Strengh to pass. If you chose grass, head south, then north-west until you reach a hole, if you chose the southern route, push the boulder south, then proceed west(there's a spot to use Rock Smash for a Max Potion) until you reach some stairs, head north, up the stairs, dodge all the grass until you come to a hole, either way, go through it.
17. Continue north until you reach a spot where you must use Rock Climb, now get climbing.
18. Dodge all the Galactic Grunts(or battle them for some quick exp) and head east, then south, down the stairs, east, and exit through the hole.
19. You should see some stairs toward the north-east, take them, but do not go through the hole, just head north until you find a single square of grass, get in it, then face left and use Rock Climb.
20. Go west, then down the stairs, then west, down the stairs, down the stairs, up the stairs, north, west, south, through the hole.
21. Continue on south, then east, and up the stairs.
22. East, then south, up the stairs(you cannot dodge these grunts), up the stairs, then west, and go up the stairs.
23. Go west, north, up the stairs(unavoidable grunt here), up the stairs, then, right before you go through the hole, SAVE!
24. You should come out on Spear Pillar.
HINT: You will battle two more grunts, then you must battle Commanders Mars and Jupiter, but just before Jupiter steps forward, your rival will run in and battle alongside you. After the battle, your rival will heal all your Pokemon and run out. Now you must face Cyrus. He is very weak to Electric types. A Lucario would really help on his Weavile.
DIALGA: I would recommend at least two Quick Balls, as many Ultra Balls, Great Balls, and Timer Balls as possible. But I can't help in the actual battle, because I didn't battle him, I just used Earthquake, then threw a Quick Ball(try it).

Ok look go to mt.cprnet or whatever where you first meet the bossok there is a surfing area go there then when you go to another cve entrance go to the one all the way to the right bring max repel it's a long way then you appear onb the top of mt.cornetthen go to the entrance aand get out the other entrance then go all the way to the right entrancethen there is a place you use rock climb to the right go there I can't help you anymore go on youtube it will explain much better

They're at the top of Mt. Coronet. You have to navigate your way through. It's like a maze.

The top of Mt. Coronet.you have to go up it from the Hearthome City side and you need a Pokemon that knows Rock Climb.

They will hold it atop Mt. Coronet

On the top of Mt. Coronet.

There is no city. They try to capture it on the top of Mt.Coronet
(start from Heartrome to get to the top of it youll need Surf,rock climb,Rock Smash and strenght I think)and after a lil while you find non other then team galactic

They are capturing dialga/palkia at the top of mount coronet

On top of Mt. Cornet.