As you know there's an Unselect All button in the storage boxes
which is useful for... not very much.
But a Select All button could be useful for moving hatched parties
to trade boxes very quickly, or putting the contents of many
smaller boxes in one large box. Now you have to select every single
pokemon individually, which takes a really long time if there's
hundreds and thousands of them.
Who thinks such a button would be very useful? Vote below and leave
a comment if you want!