Speaking to IGN, Game Freak director Shigeru Ohmori explained that the company has seen each of its 3DS games as the full extent of what could be achieved on the handheld console:
"When we were making Pokemon X and Y, we really were trying to push the 3DS system to its absolute limits - which is what we thought we’d done. But when Sun and Moon came around, we completely redesigned the system, and actually ended up pushing the 3DS even further to what we thought was the most we could draw out of it."
However, that process of improvement seems to have come to an end, with the upshot being that Game Freak will move on after the new games' release on November 17:
"With Ultra Sun and Ultra Moon," explains Ohmori, "we’ve tried to eke that out more and really, really push the system to its absolute limits, and we’re now feeling that perhaps this is the maximum of what we can get out. So we’re really treating Ultra Sun and Ultra Moon as the culmination of our work with the 3DS system."
