You point it at a printout/drawing/whatever of an AR marker and it puts the Pokemon in the picture? As to why it "found a Metapod" in your room, maybe something in your room resembles Metapod's AR Marker.
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere
i have two theories 1) Each pokemon (alt formes includdd) have a an ar marker. When the ar marker sees a marker it shows the corresponding pokemon. Therefore something in your room must look like a Metapod ar marker so it displayed it.
2) You left the window open. Because it could have crawled in when it was a Caterpie and evolved in your room.
Got it memorized?- Axel Not changing this sig until Edge get inducted into the WWE Hall of Fame. Started 4/11/11