https://www.gamespot.com/articles/all-the-pokemon-ultra-sun-and-moon-3ds-differences/1100-6454631/

The next pair of Pokemon games, Pokemon Ultra Sun and Ultra Moon, have released on 3DS, marking the series' final installments for Nintendo's dual-screen handheld. The titles are based on last year's Sun and Moon versions but tell an "alternate" story that revolves around the mysterious Legendary Pokemon Necrozma. While the core adventure remains the same across both versions, each game has some some distinct elements, so you may be unsure of which to pick up. We break down the biggest differences between the two versions below to help you decide which one to play. For more, you can also check out our Pokemon Ultra Sun and Ultra Moon review and breakdown of the new Pokemon (and everything else) in Ultra Sun and Moon.

We recently had the opportunity to interview the developers of Pokemon Ultra Sun and Ultra Moon, and one of the topics they weighed in on is which version players should pick up. "In essence there's no real problem with whichever one you buy, you're going to get a really good experience of Pokemon," said Ultra Sun and Ultra Moon director Kazumasa Iwao.