All legendaries in Pokemon Platinum

Yes, Pokemon platinum has all of the original 3 legendaries. You will face Giratina in the distortion world when you are with Master Cyrus and you will face palkia and dialga on the Spaer Pillar on top of the Mt. Coronet when you beat the entire game. You can face Giratina again in the Turnback cave just off the spring path close to lake valor.