What legendary Pokemon can you find in Pokemon Diamond?

Answer 1

You can find Dialga (in diamond only, in pearl Palkia will appear instead) on the top of Mt. Coronet, Uxie, Azelf at the Lake Acurity and Lake Valor caverns, and Mesprit will flee when you find it at Lake Verity, so you will have to chase it throughout Sinnoh. You will also have to chase Cresselia down once you've awaken it at fullmoon island. Other than those, the only two legendaries you can get without another Pokemon game or event item (or a cheat code) are giratina at turn back cave ond heatran at Stark mountain. If you migrate the three legendary golems from emerald, you can get Regigas at Snowpoint temple. If you have another ds and ranger, you can hatch a manaphy egg and breed it with ditto to get a phione. The event Pokemon are shaymin, darkrai and arceus. It is questionable on whether or not Lucario is a legendary (sort of like arcanine or salamence),but if it is you can hatch a riolu egg from Riley and evolve it into Lucario. Hope all that helped.