How do I edit a Colosseum/XD save in PkHeX without it getting wiped?

[Maetch]

I'm just doing something as simple as adding a Shock Wave TM into the file and it results in the game refusing to load it due to "data corruption", which I'm pretty sure is really part of the GCN games' anti-copying/hacking set-up. How can I get around this?

Edited February 16, 2023 by Maetch