torok on 04 May 2015
Actually, they should had a DLC option for X owners to get Y and for Y owners get X too. They just release two/three games because they expect some people to buy a full price game even if the differences could easily fit on a DLC.
And with all the "on-disc DLC hate", it's good to note that in most Pokemon ROMs, the content of the complementary game is available and it's just locked.
