Delta Trevenant Corrupted Save File

Hello, I was recently doing a Randomized Nuzlocke Challenge on one of my save files. I caught a Delta Trevenant, and saved after doing so. When I put it in my party from my PC, I opened up the Pokémon Tab from the menu, and it seemed as though Trevenants sprite was cut out? The game shut down immediately after, the screen saying "filename is nil". I was wondering if there was anything I could do to fix this. Have a great day!

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