There's the books in the library that talks about it, though you won't find anything about the shrines in them.

I think I heard that somebody wanted to put together a more readily available information index for everybody... but I don't remember too well. You'll have to ask somebody about that. Maybe I'm wrong?

[And here they've walked into the shopping district, where buildings gather with signs outside detailing their trades in few words and more people walk around outside. Blue pauses for a second, then points over to a certain building.]

There. That's where you can get all your medicines for your pokémon.

[With the busier movements of people, Blue scoops up her squirtle into her arms, who was standing still and unsure how of to move.] You're coming up here for now.