I believe it is that, after careful inspection, the gem on DIALGA's chest is a diamond. The same applies with PALKIA. The gem on it's shoulder appears to be a pearl.
dialga
The only way to get a diamond is from beating dialga (diamond only) by capturing him at MT coronet.
You can only catch dialga in dimonid
You cannot get Primal Dialga in Pokemon Diamond, only in Pokemon Mystery Dungeon: Explorers of Time/Darkness.
Only by trading from Diamond. In Pokemon Pearl you get Palkia and in Pokemon Diamond you get Dialga.
in Pokemon pearl you can only get dialga by trading with a friend that has diamond or you can trade for it at the gts
No you cannot. You can only catch Dialga in Pokemon diamond and platinum. Although you can only catch palkia in pearl and platinum.
In Diamond and Platinum, Dialga is in Spear Pillar. If you want to get Dialga in Pearl, trade Dialga from Diamond.
you don't dialga is only in diamond and pearl
yes only at spear pillar
You can't get dialga on pearl only diamond can so trade with diamond to get one.
Dialga (Diamond Only) and Palkia (Pearl Only), are supposed to be at the top of Mt. Coronet called Spear Pillar.