Q&A for How to Catch Uxie, Mesprit and Azelf in Pokémon Diamond, Pearl and Platinum

Within the first five turns of the battle, yes. It'll still be difficult to catch them, though.

There are no specific times, and they don't return.

It depends entirely on your luck. Sometimes it will take a long time, and sometimes it might take only a few minutes.

While their initial move sets are not strong, they can become very powerful if you teach them effective moves, thanks to their excellent base stats.

Yes, you can encounter the lake trio in Pokémon Omega Ruby and Alpha Sapphire. You will find them in specific mirage spots. Collecting all three of them allows you to then encounter Palkia in Omega Ruby or Dialga in Alpha Sapphire.

You should expect the process of catching Mesprit to be highly time-consuming, as it is a roaming Pokémon. You may need to dedicate many hours to successfully capture it. If you find it too challenging in Diamond, Pearl, or Platinum, consider attempting to catch it in Omega Ruby or Alpha Sapphire instead.

You can't buy Master Balls. There's only ever one Master Ball per game. That said, if you get a GameShark or Action Replay, you can hack your game to give yourself as many Master Balls as you want.

Yes, you will get another chance if you lose all your Pokémon or run away, but only before you defeat the Elite Four.

The area you're asking about was an event-exclusive room that granted access to a legendary Pokémon. Unfortunately, you can no longer legitimately enter this room or reach its destination without using a void glitch or an Action Replay device.

Yes. After Mesprit flees the cave, track it down and weaken its HP to red. Allow it to escape; then, the next time you encounter it, save your game before initiating the battle.

Giratina is widely regarded as one of the strongest legendary Pokémon you can obtain in Diamond, Pearl, and Platinum. Its Origin Forme, specifically, offers enhanced power when playing Platinum.

No, they will not reappear. You are given only one opportunity to catch or battle them, so if you knock them out, they will not return.

You can find HM Strength on the top floor of Lost Tower. An old woman there will give it to you.

You would have to soft reset until you can find one, but the odds are 1/8192 without a shiny charm. And with a shiny charm, it drops down to 1/4096. It's all up to chance.

To get the Marker Map application, speak with the President of the Pokétch Company in Jubilife City; he is identifiable by his purple attire.

You should use a Dusk Ball or an Ultra Ball. If the battle lasts for many turns, a Timer Ball can also be very effective.

No, there is no specific order in which you need to catch them. You could also try attempting to catch it when its HP is higher.