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Apparently I ran out of Leftovers to stick on bulky pokemon, so I elected to get some more. Apparently, just as I'm about to Thief the last Muchlax (using 5 Butterfrees with Thief), it summons shiny. Unfortunately, it might be hard to distinguish in the picture, but it helps to have the non-shiny adjacent for comparison. It's my second ever (and incidentally encountered) shiny in Moon. On a different note, it was unusually fortuitous that the first shiny I got was smeargle, because I basically raised it optimally to tackle the task of completing the alola pokedex.