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Legendary Pokemon Guide - Kyogre, Groudon, and Rayquaza
New to Pokemon Heart Gold and Soul Silver, you can now catch the legendary Pokemon from Hoenn. After you've collected all 16 gym badges, re-challenged the Elite Four, and defeated the trainer Red, go talk to Professor Oak and he'll let you choose one of the Kanto starter Pokemon. Take this Pokemon to see Mr. Pokemon, who lives in a house just north of Cherrygrove City, and he'll hand over the Blue Orb (Pokemon Heart Gold) or the Red Orb (Pokemon Soul Silver). Go to Route 47, just west of Cianwood City, and surf all the way to the west. Use rock climb to climb up the cliffs here, and enter the cave. Proceed through the cave and you'll find a room housing Kyogre (Pokemon Heart Gold) or Groudon (Pokemon Soul Silver). Both Pokemon are at level 50. Weaken Kyogre with grass or electric attacks and weaken Groudon with water, ice or grass attacks.
Trade with a friend to acquire the opposite Pokemon and then show them both to Professor Oak in Pallet Town. He'll give you the Jade Orb. Return to the cave off Route 47 and Rayquaza will appear at level 50. Weaken it with dragon, rock, or ice attacks.
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Latios and Latias - Non-Event
Depending on which game you're playing, you can catch either Latios or Latias. Pokemon Heart Gold players can nab Latias while Pokemon Soul Silver players can get the other legendary Pokemon, Latios. You'll first have to go on a short fetch quest. Go to the Pokemon Fan Club in Vermilion City. It's located two buildings to the left of the Poke Mart. Inside the Pokemon Fan Club, talk to the heavyset guy at the table and he'll tell you all about his Clefairy doll. Now fly to Saffron City and locate Copycat's House. It's the only purple building in town. Find Copycat on the second story and listen to her sad story about losing her Clefairy doll in Vermilion City. Fly on back to Vermilion City and talk to the guy in the Fan Club again. He'll hand over the Clefairy doll.
When you exit the Fan Club, Steven (Elite Four Champion from Ruby, Sapphire, and Emerald) will walk up to you and babble for a bit about Latias (Heart Gold) or Latios (Soul Silver). You can now catch these roaming legendary Pokemon in Kanto. Either Pokemon will be at level 35, so the best way to find Latios or Latias is to put a Pokemon at level 34 in your party, use some Max Repel and wander around the tall grasses of Kanto. The Max Repel will keep any Pokemon below level 34 from attacking you, so you'll eventually encounter Latios or Latias. Both legendary Pokemon suffer from a host of weaknesses, including ice, dragon, dark, bug, and ghost attacks, so use that to your advantage.
Note that if you're feeling like a nice person, you can take the Clefairy doll to Copycat at your leisure. She'll teach one of your Pokemon the move Mimic as thanks.
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Sinnoh Legendary Pokemon - Dialga, Palkia, and Giratina
You can obtain three of the legendary Pokemon from Pokemon Diamond, Pearl, and Platinum by trading over your Arceus from those games. Note that it needs to be a legitimate Arceus obtained from a Nintendo event or from the Hall of Origins. After you've traded, take Arceus to the Ruins of Alph in Johto. You'll be teleported to the Sinjoh Ruins where you'll encounter the character Cynthia from Pokemon Diamond, Pearl, and Platinum. After a short cut scene you'll be able to choose from Dialga, Palkia, and Giratina. Arceus will use its god-like abilities to create the Pokemon for you. You can repeat this process with three different Arceus to obtain all three legendary Pokemon.
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Wi-Fi Event Legendary Pokemon
You're going to have to wait to finish catching all legendary Pokemon in Pokemon Heart Gold and Soul Silver, since the last two can only be obtained by currently unscheduled Wi-Fi events. The legendary Pokemon in question are Mew, as well as Latios/Latias (Latios in Pokemon Heart Gold and Latas in Pokemon Soul Silver). You'll be able to easily obtain either of these Pokemon via the Mystery Gift option in the Pokemon Heart Gold and Soul Silver main menu screen. Mew will be an easy freebie, while Latios/Latias will require a little work. You'll be given the Enigma Stone, which you must take to the Pewter City Museum. Afterwards you'll be able to battle Latios or Latias right outside the museum.
While we don't know the exact dates of these upcoming Wi-Fi events, we can make an educated guess. Japanese Pokemon fans received the Mew event just one day after their Yellow Forest Pokewalker Course event ended. Here in America, the Yellow Forest Pokewalker Course event is ending soon (it runs April 1 to May 5--hurry and grab it if you haven't already), so there's a fair chance we may get Mew as soon as May 6.
As for the Enigma Stone, Japan received it four days after the Mew event ended. Their Mew event only lasted two weeks, so we might have the chance to capture Latios and Latias by late May or early June.
Check back in early May, because we'll let you know about Mew as soon as we find out.
Update: Nintendo is in fact releasing a new Wi-Fi event on May 6th, but it will not be Mew. You'll be able to get the Winner's Path Pokewalker Course, which contains rare Pokemon such as Munchlax. More information on Mew will come as soon as it's available.