Lots of questions 1) the werehouse (galatic HQ) in veilstone, all it..

1. I can't lead you exactly where to go because I'm too lazy to go get my game >.< but why not try taking another route you didn't take? And if you already obtained the Galactic Key there, go in their headquarters in the northeastern part of Veilstone. From there, at the end, you'll reach Cyrus, and you'll have to battle him and then battle one of the commanders in order to free the three pokemon of the three lakes.

2. Do all of what I've said in number one, and you'll have to go to Mt. Coronet. At the top there, you'll battle the two commanders with your rival, and then, of course, Cyrus again. And then--can you guess-- Dialga, at level 57. Bring dusk balls, and be sure to do all this at NIGHT.

3. I'm pretty sure you need all the Unown, first, but I'm not sure. And from what I've heard, you need the national dex, also, and when you've done that, he should have the tunnel dug up, and I guess you find an Electribooster somewhere in there. [Not verified-- I've only heard this].

4. Use commas next time ;] You can find some rare items, like heart scales and shards and stones, stones for Arceus and evolution stones. You can also make your secret base here. As long as you're not in a building or a cave, just use the Explorer Kit to go Underground. You meet people using the DS's wireless connector, in other words, the people you meet underground have to be within 30 feet away from you. You find treasures and spheres by digging in the wall, and you find traps by digging in the ground. To find out these locations, look at your top screen. There should occasionaly be yellow spots. Attempt to go to that(those) spot(s), and once you're there, tap the touch screen, and some yellow dots will appear on the wall, or on the ground. Treasures and spheres are on the wall, and traps are on the ground. To dig up treasures/spheres in the wall, just go up to it and press "A". Once there, on your touch screen, there should be a hammer and a pickax. A hammer can dig up more wall, but is not as strong. A pickax is pretty strong, but doesn't dig up as much wall space. Use your tools wisely. Anyway, just touch the tool you want to use and touch the screen in random spaces in the wall. You might have to dig through one, two, or three layers, and there will occasionaly be black rocks, which are impossible to break. Anyway, you have the chance to dig up treasures/spheres as long as you fully dig them up. Once more thing, you have a limited amount of time before the wall collapses (spelling?). You can find this out by looking above the wall, and how big the crack is. When the crack goes all the way to the other side of the screen, that means you put a lot of pressure on the wall, and you can't dig anymore, and you only retrieve the items you fully dug up.
Gave you warnings and hints in there, as well as the answers to your questions.

5. Once you've obtained the National Dex and beaten the E4, you'll have the chance to go to the Battle Area. When there, go to the northwestern area and talk to the fisherman to obtain the Super Rod.

1) Sorry this guide is so long, lol. Upon entry to the door to the north, it's locked. You need another key, so head to the east area and there are two grunts along the way, as well as a place where youo can get a Zinc. Climb the stairs and you'll be in a small room with a Grunt that doesn't want to fight you. He'll blabber about Warp Panels. Continue up to the stairs. Battle the grunt by the first set of Warp Panels. When you beat him, you can take one of those warp panels. The right Panel will take you to TM 49, Snatch. The left one will take you to another room with a warp panel in it, use that and you'll appear by a flight of stairs. Go up, a grunt there has Level 32 WRUMPLE. ROFL. Anyway, warp panel and another bunch of stairs you go. Take another Warp Panel and take the stairs downward. They lead you to a Scientist and more stairs. In the Basement, you'll get another grunt that won't fight you. TM 36, Sludge Bomb is there, and the Galactic Key. That will allow you to open any door in the Galactic Veilstone Building. Now, if you want TM 21, Frustration, use the Galactic Key on the right about where you were, which was blocked before. Make your way outside. If you DON'T want Frustration, skip ahead and go back to the room with the Scientist, the Warp Panel and the stairs that you were in earlier, but take the stairs up this time. Make your way around the room, fighting Grunts as you continue to move, then you can find another Locked Door, TM 21, Frustration is there. Now, outside the Warehouse, go to the Building itself. Open the door on the first floor and go up the stairs. Fight the grunts, three warp panels await you. The top one takes you to a dead end, the bottom-right will take you to another Warp Panel, to a Max Revive. The other one will have you led to a Scientist. You should soon be in a room with two beds, and stairs leading up. The beds will heal your Pok�mon. Upstairs, a Double Battle awaits, beat them and continue in the Corridor until you find three more warp panels.Take the one on the left, it takes you to stairs. Go up the stairs and SAVE! Open the door to find Cyrus, the Team Galactic Boss. Fight him, he has two Level 40's, and a Level 43. That should be easy.

2) Because you didn't go to Spear Pillar and stop Team Galactic.
3) It's gibberish.
4) It's basically a fun experience with Wireless Connection. Not Wi-Fi. You dig by using a shovel, meet people by using Wireless Connection. Treasures, by a shovel, same for Spheres. Traps are activated when you step on them.

5) Battle Arena.

1 ?
2 you should be able to, you might have to battle palkia/dialga first
3 you have to catch every letter of the alphabet in unknown
4 you go to yellow spots on the map, then tap the touch screen, then press a in front of a glistening spot you'll find ( if you mean just go underground, go to your pack, key items, explorer kit and it will bring you there) you meet people by having two people go underground at the same time
5 in the battle zone talk to the first civilian you see

Hey man lots of questions ok I'm gona try to help you the answer to #2 is you have to find the ladys key it's like right infront of the door use you're itemfinder.

#5 the super rod is in the fight area after the elite 4. #3 no their is not really a point just for fun 1# are you trying the 2nd entrance which is all the way north west of the city.#4 the underground is just for fun dig up some fossols jems to pimpout you're secret base and thats about it hope I helped .

Ok, I see what you mean by lots of questions!

1) To delve further into the galactic headquaters, you wil need to enter the building from the big HQ building not the warehouse. Once you do that, you will be able to move further into the galactic headquaters where you will battle Cyrus (the leader of team Galactic who will give you a master ball for defeating him)

2) You won't be able to go to Sunyshore until you have battled Dialga & capture/defeated it. To do this, you will need to defeat Cyrus and his minions, release Uxie, Azelf and Mesprite and then scale Mt. Coronet to defeat Cyrus and his admins yet again. Once this is done, you will have a battle with Dialga. Be sure to catch it as you only ever get to battle him once!

3) That cave that you mentioned has no real use. Except for the fact that themore unown you catch, the bigger the cave will get. A rare Pokemon known as hippotas is found in this cave. You can not find hippotas in any other spot then this cave. The longer the cave is, the more chance you have of encountering a hippotas.

4) Ok, going underground is a new feature that they introduced in Pokemon Diamond and Pearl. While underground you can make your own base, exchange spheres (spheres are the currency while underground) for rare items and dig for rare items. Ok, to dig something up, you must first find a place where an item is burried. Items are burried in the walls and to see if an item is near by, touch the touch screen and if an itemis near, a yellow star will appear where the item is. To get a round about idea as to where items are, watch the top screen and look for yellow dots to appear on a mat. Once you have found an exact location where an item is burried, face the wall where the item is burried and then press 'a'. Keep on clicking 'a' and you should be taken to a screen with many layers of rock and gravel. At the begging it should say ' x number of items have been detected'. Use the stylus and tap away the rocks to reveal the items beneath. You will often find spheres and some times you'll even find rare items such as evolution stones. At the top of the touch screen, there is a bar and with each tap of the touch screen, the bar will get more cracked. Once the bar has cracked fully, the wall will collaps and any items not fully uncovered will be lost. You will not get an item in the wall unless you have completely uncovered it. Traps are found the same way as you find hidden spheres and items. By touching the touch screen, a radar will come out like when you're looking for items but if a yellow spot is buried on the floor, you will find a trap there. 5) The super rod is found after defeating the elite four and champion. Talk to a guy in the fihgt area.

Few... Take a breath. I hope I helped!

1) Sorry this guide is so long, lol. Upon entry to the door to the north, it's locked. You need another key, so head to the east area and there are two grunts along the way, as well as a place where youo can get a Zinc. Climb the stairs and you'll be in a small room with a Grunt that doesn't want to fight you. He'll blabber about Warp Panels. Continue up to the stairs. Battle the grunt by the first set of Warp Panels. When you beat him, you can take one of those warp panels. The right Panel will take you to TM 49, Snatch. The left one will take you to another room with a warp panel in it, use that and you'll appear by a flight of stairs. Go up, a grunt there has Level 32 WRUMPLE. ROFL.

Anyway, warp panel and another bunch of stairs you go. Take another Warp Panel and take the stairs downward. They lead you to a Scientist and more stairs. In the Basement, you'll get another grunt that won't fight you. TM 36, Sludge Bomb is there, and the Galactic Key. That will allow you to open any door in the Galactic Veilstone Building. Now, if you want TM 21, Frustration, use the Galactic Key on the right about where you were, which was blocked before.

Make your way outside. If you DON'T want Frustration, skip ahead and go back to the room with the Scientist, the Warp Panel and the stairs that you were in earlier, but take the stairs up this time. Make your way around the room, fighting Grunts as you continue to move, then you can find another Locked Door, TM 21, Frustration is there. Now, outside the Warehouse, go to the Building itself.

Open the door on the first floor and go up the stairs. Fight the grunts, three warp panels await you. The top one takes you to a dead end, the bottom-right will take you to another Warp Panel, to a Max Revive. The other one will have you led to a Scientist. You should soon be in a room with two beds, and stairs leading up. The beds will heal your Pok�mon. Upstairs, a Double Battle awaits, beat them and continue in the Corridor until you find three more warp panels.Take the one on the left, it takes you to stairs. Go up the stairs and SAVE! Open the door to find Cyrus, the Team Galactic Boss. Fight him, he has two Level 40's, and a Level 43. That should be easy.

2) Because you didn't go to Spear Pillar and stop Team Galactic.

3) It's gibberish.

4) It's basically a fun experience with Wireless Connection. Not Wi-Fi. You dig by using a shovel, meet people by using Wireless Connection. Treasures, by a shovel, same for Spheres. Traps are activated when you step on them.

5) Battle Arena. yah what he said