You can't because it wasn't invented when that game was made. You can only get it on Pokemon diamond, platinum, and heartgold and soulsilver if you got the arceus event from DPPt. There is no way to get a 4th Generation Pokemon in a 3rd Generation Pokemon Game.
you cant catch Dialga he wasn't created back then
Chat with our AI personalities
You can't get dialga in firered.
Dialga is unavailable in FireRed.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
its is dialga
NO!!!!! YOU CAN ONLY CATCH PALKIA ON PEARL you can't catch dialga on Pokemon pearl but you CAN trade it you only get both in Pokemon platinum