i think dielga can lern.
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No, because it's a Pokemon move that only dialga can know, and dialga cant learn spacial rend. Palkia controls space so it makes spacial rend and dialga controls time which makes roar of time!
Yes, Darkrai can learn the moves Roar of Time and Spacial Rend.
If you captured Dialga on Spear Pillar in the game, it starts with Roar of Time. If you cheated for one way under leveled than the real Dialga found at Spear Pillar, it learns it at Lv. 40 in Diamond, Pearl, and Platinum. And in Pokemon HeartGold and SoulSilver, it learn Roar of Time at Lv. 46.
Arceus cannot learn roar of time or spacial rend.
Palkia does not learn Roar of Time, that's Dialga. Palkia has it's own unique move: Spacial Rend.