Clearly, that is Noah's Ark. It will be a mystery gift available for download that will activate once you fully complete the National Dex. Arceus will warn you of a great flood that's coming, so you need to catch two of every Pokemon and put them on your boat. Then, once the flood covers the entire Kalos region, you sail far away, ending up at the mysterious new region hinted at by the hiker. Then, the strange souvenir will activate from your bag, acting as a sort of metal detector, bringing you to the location of an ancient temple. When you walk into the temple, the ghost girl will appear and declare that you are the one. She will teleport you all the way to Vermillion City. From there, surf to the old pickup truck and press the A button fifteen times. If you do, then Mew will appear and hand you a copy of Half Life 3.
Trust me, I hacked the games, and this is 100% legit,