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Uhhh...on Diamond i did it after the pokemon league, i was gonna use Uxie, Azelf and Dialga in battle tower (All lv.50), but i ran into it, caught it, then pwnd battle tower with the lake trio.
Last thing i remember on platinum, my Lv.17 Sneasel used Night Slash and OHKO'd the stupid thing.
Before in my most recent run through my friend's Diamond. He asked me to do the tweaking glitch. I started over, did it and sent Darkrai to his Platinum. He had a Shaymin already so he let me take it. I was going to send the Shaymin to my Diamond and then start over to get another Darkrai but I thought: "hey, I could catch the other legendaries too." I caught Dialga and the lake trio before league, just to be disappointed that Cresselia cannot be caught before the league.