^At least we have the GTS now.
In my days...
*puffs on a pipe*
... we had to transfer 'mons via a cable. You had to physically befriend somebody with another GameBoy and a copy of the other game. And, of course, one or both of you had to own the Link Cable. Nowadays you just hook the 3DS up to Wi-Fi and upload your version exclusives to the GTS, asking for the version exclusives of the other game. Easy-peasy, and takes five minutes.
In my days...
*puffs on a pipe*
... we had to transfer 'mons via a cable. You had to physically befriend somebody with another GameBoy and a copy of the other game. And, of course, one or both of you had to own the Link Cable. Nowadays you just hook the 3DS up to Wi-Fi and upload your version exclusives to the GTS, asking for the version exclusives of the other game. Easy-peasy, and takes five minutes.