I'll start: the Sinjoh ruins.
If you don't know what I'm talking about, you have to take an Arceus to the Ruins of Alph. This activates an event wherein you are transported to said ruins, eventually given a choice between a Dialga, a Palkia, or a Giratina. You then get the one of your choice at level 1.
Anyone else done this yet? That is some crazy stuff. First time I've seen real photos in a Pokemon game. I chose Dialga.
So, there's mine. Anyone else found any interesting events?