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ShaggySmurf
The events were back in August '09, if I recall correctly. I participated in two of them, the Member Card and Oak's Letter, and I did manage to catch Darkrai and Shaymin in Platinum, but I restarted because I thought I'd lost the lake guardians forever, and as a result, I lost the event Pokemon. Even after that, I've been tweaking my Pearl to death just to get the two elusive Pokemon, and I stocked up on something like 125 Ultra Balls and 50 Timer Balls to get them covered, and I must say it's easier on the 3DS to tweak because it's easier with the C-pad. This doesn't involve changing your finger to the next arrow on the D-pad. However, I missed out on the Arceus event when I realised I'd missed it, and so I can't tweak for it. However, I managed to get Arceus in Black via a DW event that was back in 2012.
You got lucky, bro. The events were only for Platinum. Apparently Nintendo decided not to give them away for Diamond or Pearl. As for Arceus, I do have it, but like I said, it's at level 100. I'm the kind of player that wants to explore all parts of the game. I prefer to get the item that unlocks the area to a rare pokemon, than have that pokemon handed to me. So I got bummed out when I realized that I was never going to get the Azure Flute to unlock the Hall of Origin and catch Arceus myself. Pokemon like Jirachi, Deoxys and Mew i'll be ok with, only because they are no where in the game.