Extra Missions - The Dialga Mission

Available From: June 16th 2008 to July 18th 2008 (Japan), ??? (America)
Locations: Almia Castle

Walkthrough:
The mission starts with you at your house in Chikore Village, exit the house and go north until you encounter the Ranger with Staraptor. She will show you Almia Castle where a temporal portal has appeared and tell you to go investigate and thus your mission begins. You immediately fly to the bridge in Almia Castle. Go right and in that room you will discover a door that requires Mismagius's Psycho Power in order for you to pass so capture the two nearby Vulpix and go left and use them to light the torches. Mismagius is within the room. Capture it and use it here. Be sure to capture any Ice Pokémon you find as you'll need them. Continue on and you will find the exit is blocked by a giant iceberg that requires Flame * 4. this is sorted by as Ninetales in the room to the right, which itself is blocked off by an Iceberg needing Flame * 2, obtainable by a Houndoom in the room to the left.

Once those have been sorted you'll hit the main room which has the portal in with Dialga. this is a boss fight so it has the huge HP bar. If you captured Ice Pokémon, use their assists to freeze it and do damage. Its first attack is a powerful hyper beam that will leave it to recharge for a couple of seconds giving you perfect opportunity to attack. Its second sends out multiple blue flames that damage you across the stage. Its third attack drops several balls onto the stage causing explosions where they land, these do massive damage so lift your styler up no matter what. If you do not capture it within sufficient time however (about a minute and a half), you will be thrown out of the battle and back in time to Chikore Village, having to repeat it all until you capture it. Once captured, it will leave and the mission is over.