After you what? And what game? I don't think I looked at what category you put this in. So I to have a question for you to answer....... WHAT IS THE POKEMON DIALGO???!!!
So I don't rely know how answer that so.....SORRY!!!!!
In mt. cornet folow the team galatic people until your at spear pillar battle everyone then, battle cyrus. If you have a master ball, battle palkia or dialga and catch it.
dialga and palkia
catch or defeat palkia and go to lake valor and you Will find azelf
the dialga,palkia,arceus and giratina the are in Mt.Coronet
uzie,mesprit,palkia,azelf,giratina,heatran,cresselia
Really you find all three legendary pokemon. You go to Mt. Coronet, Go to spear pillar, Dialga and Palkia will be in the back and Giratina will be in the front. after you get past the distortion world you use rock climb and in the meadow you will find Dialga and Palkia.
On the top of Mt. Coronet,you will find Palkia(Diamond you will find Dialga),BUT,There is another legendary Pokemon if you use action replay,That Pokemon is ARCUES
After you beat the 7th leader, you will go to the final lake(I think it's valor), help your rival defeat the galactic commander there. Then go to the galactic headquarters and do a bunch of stuff. Then go up through Mount Coronet. At the top, you'll battle 2 of the commanders and then Cyrus. After that you can battle Dialga.
rotom,uxie,mesprit,azelf,palkia,heatran,regigigas,giratina,cresselia,phione,manaphy,darkrai,shaymin,arceus
You can't unless you go to the trade center and offer dialga or any legendary Pokemon. or you can find a friend with Pokemon pearl and ask to trade. hope this helps
ho-oh lugia dialga palkia raquaza manaphy jirachi groudon kyogre and mew two and mew
palkia was not created until Pokemon pearl was released