It depends when you defeat him at galactic headquarters you have to go to mt.coronet to catch palkia. you'll need surf,rock climb,strength probably rock smash you'll have to fight team galactic members and you'll have to double battle with Barry then you battle Cyrus again to get palkia. Be sure to safe your game data before you battle commander Jupiter and mars and Cyrus and save before you battle palkia
when beat Cyrus on mount coronet, afterwards you can catch it
you get the master ball once you beat Cyrus in the galactic building
In Diamond you can get Dialga, but you find him in the Spear Pillar after you beat Cyrus of Team Galactic. Im Pokemon pearl you find Palkia.
you have to beat team galactic and Cyrus and kill or catch palika (if you have dimond dialga)
You need to beat Cyrus (galactic boss) and then keep going through galactic building in Veilstone, beat Saturn, go up to each Pokemon and press A
Beat Cyrus in the Team Galactic Veilstone Building. He'll give you a MasterBall
he is in veilstone city
Cyrus is in the galactic veilstone HQ and spear pillar.
the same way to beat Pokemon PEARL!!!!
He is the leader of team galactic
in the light house
Pokemon Ruby= Magma Hideout at Lilycove Shore Pokemon Sapphire/Emerald= Aqua Hideout at Lilycove Shove Pokemon Diamond/Pearl= After you beat Cyrus at Veilstone City