The script hung and killed my quilava

I had just gotten delta Quilava when I was putting it in my pc so I could give that one lady in Amphirite town her Hypno, and then the script hung and it restarted with hypno in my party and quilave just gone. can i roll back my save in some way or do I just need to trade for one now?

Load up a backup with this nifty lil’ guide.

Thank you :grin:.