So, from what I've heard before ORAS released you could apparently catch Dialga in the sky. How? All I keep getting is Wingull and Pelliper! Can you only get it after the Delta Episode? (Currently my highest pokemon is a Level.59 Mighyena, so there is no way I'm gonna be able to survive Deoxys yet.)
Thank you in Advance for the help.
~SlyMew~