Honestly, I don't believe there is a "magical battery", If the middle pin is like what we use at my work all it does is gets a battery lvl of usage left. Hence displays it on the Screen. Some Cell phones not made by sony and camcorders have a third pin.
As for the "magical memory stick" I agree with if you watch the PSP boot up and look at the MS light it flashes for a few seconds... not to look at the sze of the MS nor space left but its looking for something. Take note when the PSP is in the XMB and you pull the MS out and put it back in or another one the light only flashes once to get the memory free amount. And I don't think its a specific type of memory card I think any can be used. It just needs a file of some sort. But then again that "magical Stick" Vulpix has would write over flash and hence a trigger is needed then. But I still doubt it being the battery. For all we know could be a combo press of buttons or holds.