Ok, that's what I figured it had to be after trying it again. Thanks for the help!

If anyone could check out my run to see where I went wrong (besides messing up the ditto manip lol), it would be greatly appreciated. I never used to solflock like this, but the last two days it's been happening a decent amount of the time. I've checked the guide 5 times over and watched my run, and I still have no idea what I'm missing. After the video ended, I tried doing it again starting from my ditto save, paying close attention to my menuing when switching slots at the end. Still softlocked, so I'm at a total loss.

By the way, I'm playing on BGB and was unaware that I had to show the whole window until today (which I will obviously start doing now).

EDIT: I did another run, same thing happened. Tried it again starting from the Ditto save, taking it the slot inputs really slowly. Worked this time. Maybe I'm pressing down too soon or something and it's not registering the inputs? Regardless, that has to be the problem area, so I'll just have to be really careful at that part