How do you get to the top of Mt. Coronet?

Answer 1

You first go to celestic city and surf down the stream under the bridge until you see a rock wall. use the hm rock climb to ascend the wall and ta daa.

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Bad Desciption (for Platinum)?

yeah because i have platinum
Okay, I have divided the answer into 3 Parts:

Mt. Coronet

Before going, make sure to stock up on lots of Ultra Balls. Also be sure to have lots of Dusk Balls, which can be found in Pastoria City's Pokemon Mart. The reason is that you'll soon be catchingDialga/Palkia. In addition, you might need (Super/Max) Repels if you don't want to encounter wild Pokemon every few steps. You'll also need a Pokemon that knows Rock Climb. Now fly over to Oreburgh City and head east, entering Mt. Coronet on Route 207.

Surf across the water at the north. Go up the stairs and pick up the Protein. Climb the rocks at the very east and go up the steps. Pick up the Max Potion at the north and also the hidden Ether on the small piece of rock nearby. Go all the way south for an Escape Rope. Go north, then south again. Get outside through the exit temporarily, climb down the rocks, and pick up an Iron. Go back into the mountain and go as far north as you can. Cross the bridge and go south for TM80 - Rock Slide. Go north for a Revive. Now head east to get to the lower level and go inside the cave opening. Go up the steps and you'll be surrounded by three steps on all sides. Take the one on the right for a hidden Max Revive on the southern-most rock. Go back and go north, where you'll battle a Galactic Grunt. Go west and pick up the hidden Super Repel on the corner rock. Fight the Grunt and exit through the south.

Climbing to the Peak

Now you're outside in a snowy environment. The goal now is to climb to the top of Mt. Coronet. Go east, north, and climb the rocks. If you go east into the cave opening, you can go straight up the steps for a hidden Ultra Ball. Smash the rock at the bottom-left corner and pick up the hidden PP Up on the rock that's revealed. Go outside, head west, then south (not through the grassy area). Push the boulder out of your way and continue west. Smash the rock along the way and pick up the hidden Max Potion. Head north and go into the cave opening. Back inside, go straight and climb the rocks. Battle the Galactic Grunt, smash the rock near him, and pick up the hidden Revive. There's also a hidden Ether on a northern rock. Go east, battle the Grunt, and go south a bit to pick up a hiddenEscape Rope. Head out again by going east.

Go all the way north for a hidden Rare Candy on the single rock. Go south a bit and go down the steps. Check out the cave opening to battle some Galactic Grunts and pick up a few hidden items, including a Rare Candy hidden in one of the rocks in the lowest level. You won't be able to go into the cave opening blocked by the Galactic Grunt. After they leave later, however, you may go inside to pick up TM02 - Dragon Claw. After that, get out of this cave area.

From the outside, climb the rocks westward and head west. You'll find a TinyMushroom hidden on a rock and a Big Mushroom on the northern-most level. You'll soon see another cave opening, which you should enter. On the second rock, you'll find another TinyMushroom. Keep going east and head up the steps. Battle the Galactic Grunt and pick up the hidden Max Potion behind her. If you go south as far as you can, you'll be able to pick up a hidden Stardust on a rock. Fight the Grunt and head west up the steps. As you go north from here, you'll battle one last Grunt before finally reaching the peak of Mt. Coronet.

Spear Pillar

At the top, you'll battle two Galactic Grunts before you get to the final challenge. Walking forward, you'll find Commander Cyrus, Commander Mars, and Commander Jupiter all in one spot! Commander Cyrus will summon Dialga (in Pokemon Diamond)/Palkia (in Pokemon Pearl). As the beast comes out, you'll see some impressive animation sequences. After Cyrus is done talking, walk forward and Commander Mars will challenge you to a battle. Suddenly, Rival comes over and gets into battle stance with Commander Jupiter. A challenging double battle will ensue (challenging mainly because Rival's Pokemon doesn't seem to help much). After defeating the two of them, Rival will heal your Pokemon and you'll observe Dialga/Palkia forming a galaxy as instructed by Cyrus. Luckily, the Legendary Trio will arrive to mess up his plans. Furious, Cyrus will battle you one-on-one with some pretty powerful Pokemon. After defeating him, the Team Galactic will leave, and Professor Rowan and Dawn will come. Professor Rowan tells you to help Dialga/Palkia out and the way to do that is to capture it (or defeat it)! The time has come...

Before going for Dialga/Pearl, save your game! Also, note that you should NOT use your Master Ball. This Pokemon is easier to capture than other legendaries in the game. Dialga/Palkia is at lv. 47 and it's very strong. Dialga is a Steel/Dragon-type Pokemon and Palkia is a Water/Dragon-type Pokemon. Try to get its HP as low as possible and throw Ultra Balls and Dusk Balls at it (while listening to the wonderful background music). Once you have captured it, Professor Rowan will come over to praise you on your incredible feat. Afterwards, go all the way north to pick up either the Adamant Orb (Diamond) or Lustrous Orb (Pearl), which powers up Dialga andPalkia, respectively.

Now, you'll be able to catch the Legendary Trio by re-visiting the three lakes. Be sure to have plenty of Dusk Balls, since these are the best types of Balls to use on these legendaries.

Answer 2

In order to reach the peak of Mt. Coronet, you'll need a Pokemon with Rock Climb, one with Strength, one with Surf, and to reap a lot of the hidden items, a Pokemon with Rock Smash.

To start your climb, you must first enter Mt. Coronet from the Orburgh City entrance. Surf across the water to your right, Rock Climb to the ledge, and go up the stairs.

From there, there are some pretty decently high level Pokemon, so watch your back. Go through the maze-like path in this room until you reach the opening in the back. It should be pretty straightforward from there. Hope this helped.