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So I picked up a Japanese copy of Emerald and loaded up the save. It was on far away island and had just caught a Mew. Turns out it was shiny.
After poking around a bit, it is a rather common save where someone had done RNG manipulation to catch a shiny that has been distributed on the web. Someone must have flashed it to this Emerald cart. Kinda weird the Mew wasn’t stripped from it though. Why go through the trouble just to never take or use it?
Totally keeping it though. Shiny Mew is kawaii as heck.