>>140312603DS saves are linked to the 3DS it was working on
You can back up your Pokemon to the Pokemon Bank, so just keep a small team on the cart if you're afraid of losing them.
>>14030185Pro: Game with you wherever you go. Believe me, not having to dig out a game case every time you want to check the one or two daily events is quite nice.
Pro: Not going to lose the small cartridge
Pro: If nintendo ever drops the cartridges next console and goes with all downloads, you don't have to rebuy.
Con: Not able to resell when Gen VII comes out
Con: If the 3DS is stolen, you can get the games back with a police report but the saves are lost forever, but you do have pokebank again.
The games being lost issue really shouldn't matter all that much. If the guy is stealing your 3DS, it's going to be in the bag with the rest of your games, not necessarily stolen from your hands.