User blog comment:Kogath/Monster Hunter X Discussion/@comment-9415978-20150725180312/@comment-5167887-20150725200241

I think it also explains why 4/G never made it onto WiiU. As Capcom developped 4G, they began developping X too, and they must have planned to include 4th gen games in X from the start. That might explain why 4 and 4G remained portable games.

And also why Moga village isn't in X too, because the only portable game in 3rd gen was P3rd.