As a Pokémon enthusiast with extensive knowledge of the games, including Pokémon Platinum, I can guide you through the process of obtaining Dialga and Palkia in the game.

English Answer:

To encounter Dialga in Pokémon Platinum, you must first complete the main storyline involving Team Galactic. After you've defeated their leader, Cyrus, in the Team Galactic HQ, you'll be able to access the Spear Pillar. The Spear Pillar is located in the Distortion World, which you can enter after the storyline. Dialga can be found on the top floor of the Spear Pillar, where it's holding a battle with Palkia. You can catch Dialga after you've defeated it in battle.

As for Palkia, you'll encounter it during the same storyline event at the Spear Pillar. However, you cannot catch Palkia immediately because it will flee to the Turnback Cave after the battle with Dialga. To catch Palkia, you'll need to go to the Turnback Cave, which is located in Sinnoh's southeastern region. Once inside, navigate through the cave until you find Palkia. It's important to note that Palkia will also flee from you, so you'll need to use moves or abilities that prevent it from escaping, such as Mean Look or False Swipe to lower its health without knocking it out.

Chinese Translation:

在《精灵宝可梦 白金》中，要遇到迪亚鲁加（Dialga），你必须首先完成涉及银河团（Team Galactic）的主要剧情。在你击败了他们的领袖赛库洛姆（Cyrus）之后，你将能够进入位于扭曲世界（Distortion World）的枪柱（Spear Pillar）。在完成剧情后，你可以进入枪柱。迪亚鲁加可以在枪柱的顶层找到，在那里它正在与帕路奇亚（Palkia）进行战斗。在战斗中击败迪亚鲁加之后，你就可以捕捉它。

至于帕路奇亚（Palkia），你将在同一个剧情事件中在枪柱遇到它。然而，你不能立即捕捉帕路奇亚，因为它会在与迪亚鲁加的战斗后逃到反转山洞（Turnback Cave）。要捕捉帕路奇亚，你需要前往反转山洞，该山洞位于神奥地区的东南部。一旦进入，穿过山洞直到你找到帕路奇亚。需要注意的是，帕路奇亚也会从你面前逃跑，所以你需要使用能够阻止它逃跑的招式或特性，比如恶颜（Mean Look）或者假动作（False Swipe）来降低它的体力，但不要将其击倒。

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StepsObtain the National Dex using high level Pok��mon.Beat the Elite Four and the Champion.Talk to Cynthia's grandmother in Celestic Town and find the Adamant and Lustrous Orbs.Buy any kind of Poke Balls, but preferably Ultra Balls.Head to the top of Mt. ... There are 2 portals, pink for Palkia, blue for Dialga.More items...read more >>