Something weird but as being a remake of D/P,

YOU can catch DIALGA

First, Stop Team GALACTIC at Stark Mountain From ctaching HEATRAN.
Go to the cave with the Pixyz in The town where Cynthia's Grandmother lives, and Cynthia will appear.
She will tell you about the Adament and Lustrous orbs If you have the Platinum orb.
Go to the part of MT.Coronet with the Waterfall and go in the part the waterfall blocks.
In it you will find ADAMENT ORB on the the left and LUSTROUS ORB on the right.
Next go to the spear Pillar.

There will be a Blue Demension when you go there.

There is a new sprite for DIALGA.

Most suggseted team for catching Dialga:

EMPOLEON
STARAPTOR
METAGROSS
ABOMASNOW