Palkia will appear and start a new chain of event AFTER beating the story mode.
The space raft
Beat Palkia
You find him in spacial rift.
You have to beat palkia the second time
You must have recruted dialga and palkia and finished marine resort
Spacial Rift
In time you can get Celebi on your team. In dark you can get mewtoo on your team. And everyone knows the other one...Palkia Is Dark (Star Pokemon Juts Like In Pearl) and time dialga actually i have darkness and i've got both palkia and dialga...
They both carry the same story, so yes the legendary Pokemon does.
You get Palkia in a dungeon called spacial rift.
No. You must defeat Dialga and then defeat palkia and darkrai
well you have to defeat darkrai after palkia and dialga.i got to warn you its pretty hard.
Time\Darkness\Sky\:recrite palkia and dialga Blue\Red\:Beat the game once