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I was just sorting through and cleaning out old data, and noticed this screenshot.
It was a loading screen in-game notification that there was a limited edition Pikachu for two weeks, for the festive period of 2016.
I wonder why they didn't continue with loading screen notifications? Small, easy to digest notifications with immediately useful information whilst you wait for the game to load. Most of the in-game announcements are large blurbs of text that don't immediately communicate the most vital and essential details, and many more now just link to the blog on their site for further information.