it is map 12
you have to look on the map, and near the valor lake there is an empty square, you should find it there.
Go to Lake Acuity use surf till you get to the cave in the cave you will find Uxie Lake Valor you can find Azelf .At Lake Verity you meet Mesprit but you have to chase it around sinnoh on your marker map it will show were it is.You can only do this after you visit the spear pillar.
in the map 7
It is a poke'ech app youn receive from the manager in jubilife city. It shows you roaming Pokemon such as mesprit after you see it in the lake cave and you can place a shape somewhere on the map to mark it.
on map 11
if you go to map 2 then go to that cave and click next map walk around in there for a while it will apear then catch (make sure that you have a pokeball or something to catch it with)
Map 11
Map 5
no
They are located all over the map.
That map doesn't exist.
map 17