isn't Giratina the Dimensional Guardian? Does it seem to you that Dimension goes with Time and Space?
Wait a minute...
I change my mind, I think Mesprit fits better!
Remember when the dude (I forget who) chained up Dailga/Palkia, then Dailga/Palkia got wild? Then Mesprit and her siblings came in to stop D/P?
let's modify the plot a bit:
The Battle of Time and Space has become gargantuine... Dailga and Palkia have both run loose and are in a battle for control of the universe!
(here's a basic layout of what happens:
There are referances to both Dailga AND Palkia, rather than just one,
Basic plot of D/P, but when it comes to awakening the legendary, the whole plot shifts!
now, instead of TG waking one legend... they try to awaken both! however, it only causes an all-out battle of the universe! and suddenly... who's that in the sky?
A black Dragon? Giratina to the resque! And did he bring backup!? Why, it's none other than the pixie trio!
the chain of what happens next:
Dailga and Palkia get into a fight
Giratina comes in to settle the score
After the battle, Mesprit sends the dragons of to their own caves/islands/whatever to rest. Mesprit and her siblings then return to their caves
You can then go catch them...
um... yeah... I'll leave this for you guys to debate