I was looking for Miltank on the route next to the Miltank farm(I forgot what its called)and It was probaly a glitch but I found a level 13 Arceus.I already had a level one hundred Arceus and I got palkia.If you have Arceus,go to ruins of alph and make sure Arceus is following you.Go to the research center and this man will bump into you.He will go to mysterious hall with you and then you will disapear.You will be transported to the stage place.If you leave that place,you will meet a hiker.He will tell you to come down to the lodge.Do this.Put all your pokemon exept Arceus in the p.c box.Talk to Cyntina.She will take you back to the stage.Do what she says.Go on the stage.The red circle represents Girantina.The purple represents Palkia and the blue represents Dialga.Step on which one you want.A very long video will come up.(Its so funny when it shows a real city and a little cartoon Arceus!)Then you will get either a palkia dialga or girantina.Its only level one so be prepared to train hard! It waz so funny when a bellsprout made Palkia faint.
!