I think both Latias and Latios should be moved down. They're easily killed or walled by Arceus (depending on the form) and somewhat checked by Darkrai, which can even sometimes set up on it (mostly if it has sub). They also can't OHKO Mega Diancie which will most likely be able to revenge kill it, at the very least. They can't do anything to Klefki, can't do anything to Lugia, outsped by Rayquaza-Mega and are killed by Yveltal. There's no real reason to use them, as they're either killed or outclassed by some of the most common Pokemon in the format, especially because you can use multiple of the same Pokemon. Defog support isn't really enough reason to keep them so high in viability.