I've been all over the event map at least 5 times already, and I have not seen anything that even resembles a shiny litwick, pikachu, eevee, or riolu anywhere (including some of the more hidden spots). I also spent 3 Christmas coins on the hint for litwick (the first hint was that he is around shops and houses), and the second hint tells me that it is in Evergreen Island Village (which I already suspected and searched multiple times). I'm not sure if this is a bug or intentionally that difficult, but as I've mentioned, I've checked literally everywhere including behind trees, houses, etc. Thanks.