LadyMewling

Ah, you're right. I created a blank Brilliant Diamond save file in 20230709 and both Pokemon showed up as legal in it. I don't care about legality in gen6/gen7, since I'm playing them in an emulator. Thanks!

I have been working on two Ribbon Masters; a Shiny Mew and Shiny Shaymin, playing through all the mainline games in order on emulators. I've been using PKHeX to move the 'mons from one game to another. I recently upgraded my computer and today I downloaded PKHeX 20230709 to move them from X to Omega Ruby. 20230709 shows the following legality check error on both Pokemon: I downgraded to 20220204 and it says both 'mons are legal. I have done zero modifications to the Pokemon with PKHeX aside from moving them across games. I caught Mew from Japanese Emerald's Faraway Island and Shaymin is from English Platinum's Flower Paradise. I have attached both Pokemon from the X save, exported with PKHeX 20220214. 151 ★ - Ｍｅｗ - 640F7CB91DDB.pk6 492 ★ - Shaymin - 66BAC3FF9A27.pk6