Fuck. I took my DS to school, was going to play it, but then the card wasn't in the fucking slot. Then I went home, couldn't find it, no matter where I looked. Motherfucker.
That really sucks~ :( Sorry that happened to you~ So many kids around my school bring their DSs and their copies of the game every day, but I try not to bring mine's too often for fear of losing it.
Oh man, that's awful! That happened once to me with SoulSilver only to find it in the cuff of my shorts? Try looking in odd places, but of course don't forget to check your bag, car, etc. Good luck!
Sorry to hear that. :(
If you see anyone playing Pokemon X on their 3ds, peek over their shoulder and make sure their team doesn't seem familiar, if you know what I mean.
I only took my 3DS to school once and never brought it back again.
I don't know how you were able to play Pokémon X with a DS.
Anyway, too bad for you, having things stolen sucks a lot. That is one of the reason I only buy digital games nowadays.