No one knows.Once you defeat him at the spear pillar he'll be gone forever .
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you nd to go to spear pillar then beat Cyrus catch giratina and yure on
beat Cyrus at galactic HQ free there beings then go to spear pillar and there's diagla
The spear pillar
you can catch them at the spear pillar i think after you beat the pokemon league or get the national dex. ther will first be a blue diamond. go in front of it and it will ask you if you want to battle dialga. choose yes and capture. then when you are done go into mount coronet's door from the spear pillar and go back to the spear pillar and you find a pink diamond and it will ask to battle palkia. choose yes and capture. hope this helped.
To beat them, gothrought the Maze cave, Mt. Coronet. Get to the top in Spear Pillar and You see Galactic Admins. Walk to them. You start to speak to Mars, when she gets mad at you. Jupiter wants to watch you lose, so she teams up with her. Rival burst to the center and joins you for a 2 on 2. Then win. You see Cyrus using the Red Chain. Dialga comes. The three pixies come to help you. My memory's a bit foggy here, but anyway, Catch or Beat Dialga. You Beat Cyrus' Master Plan!