Black/White 2 sidequests

[Ton]

So I'm dicking around in the postgame for BW2. I've managed to do a couple things, like find Regigigas (But I don't have the Gigas, so he won't wake up. Whatever) and I found N's Castle. I also got Cressalia and Heatran. I also woke up the Lake Trio and they scattered to the winds.

I know there are some other things, like Keldeo and the genie-looking things that I can catch, but I have no idea how to find them. Anyone have any pointers?