Yes, only if you defeat the Elite Four all over again. :)
No the only way to get it now is from a friend.
no but if u want a giratina go to spring path and in the cave is a giratina lv. 70
Yes,you can if you defeat the elite-4 and the champion.
Yes , but first you have to defeat the elite four and champion again
Yes, but you have to defeat the Elite Four and the Champion again first.
you can't find Uxie again if you have knocked out Uxie, unless u defeat the elite four again.
Well I caught my dialga with a timer ball so I still had a master ball left to catch girtina so use a quick ball dusk ball or timer ball
You can't re catch Entie after you defeat it.
In Pokemon Diamond and Pokemon Pearl, there is no possible way to catch a Giritina. You can, however, either catch one in Pokemon Platinum or trade with someone who does have one. In Pokemon Pearl, you catch Palkia at Spear Pillar. In Pokemon Diamond, you catch Dialga at Spear Pillar.
Anything tbh you can defeat the Pokemon league again or catch other rare Pokemon:)