Did you download this game and patch it through the link here to Pokecommunity or did you find it elsewhere on the Internet
The version that's uploaded elsewhere is not the most up to date version and you will not be able to get the newly added Pokemon if you play that game. As many have been told before, you must download the game from the OP or you'll play an older version of the game. It is not possible to continue with your game if you are currently playing the old version and try to update to this new version, your only option is to continue play the old version or start over.
I've updated the OP to address this issue.