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Here are some steps to try to get one in your game with your OT. Download Tera-Finder and the Gimmighoul event from the Event Gallery. Use Tera-Finder to import the event and move the day forward in your game so that the raids roll over then save. Use the Tera Raid Editor to search for a shiny raid via the raid calculator and inject that raid into one of your active raids. Defeat the raid and collect coins to evolve it to Gholdengo. My assumption is that it is flagging something as wrong because shinyness is based on the combination of TID, SID and PID if I am not mistaken.

Added handling in the latest commit to ignore out of bounds values (and clamp back stats to their maximums if out of range). https://github.com/kwsch/PKHeX/commit/b4aeb1ac7c989d410ec581cfb107861b8ffcb0ba Not sure if that'll fix your issues; if you used a cheat code that corrupted parts of your save data, dunno what exactly it corrupted.