Blahsadfeguie
Starting Trainer
While training my Pokemon in the Ruins of Alph, after running into a battle, every option (Battle, Items, Pokemon, Run) took me to the Items menu, leaving me unable to fight, run, or switch out. Using an item would result in the battle round executing as normal, but the bug would persist, still taking me back to Items every time I tried to select something else. Occasionally I would press Accept while selecting an item and nothing would happen, then pressing Accept again would close out of the Items menu and take me back to the battle screen. I was forced to quit the game without saving.
This occurred after I scrolled through my TMs to see if I could teach any of them to my Pokemon; I basically selected each TM/HM I had, checked if a certain Pokemon could learn it, and backed out without attempting to teach it to anyone. This seems to me like the most likely cause. However, I was unable to reproduce the bug by doing the same thing later. I'm not sure what else might be relevant, but I'll provide further details to the best of my recollection if asked.
This occurred after I scrolled through my TMs to see if I could teach any of them to my Pokemon; I basically selected each TM/HM I had, checked if a certain Pokemon could learn it, and backed out without attempting to teach it to anyone. This seems to me like the most likely cause. However, I was unable to reproduce the bug by doing the same thing later. I'm not sure what else might be relevant, but I'll provide further details to the best of my recollection if asked.