When can you catch Latios?

Can you only access Missions 6 and 7 postgame? I haven’t gotten a call from the director of the place in a while telling me to do new stuff, so…

Yup. You need rock climb, a pretty post game ability

Do you need Rock Climb specifically, or can it be replaced with other moves? And if you do need it, how do you get it?

You need the hiking boots. It cannot be replaced. You get it by following Taen and Orion’s postgame story.

So it’s entirely postgame? Bummer.