There was one bug in particular when I tried getting one of the dragon masks, but couldn't because there was a bug with the dragon claw door. I was eventually able to, but I forgot how to fix it.
I remember one time, I wanted to get the gloves with unarmed damage, but the guy who had them was gone when I tried getting them. I guess that's why I made a new file so then I can Falcon Punch people in one hit.
Or Knock Off. In the competitive scene, Gen 5 Knock Off is a godly move, but in the games most enemies don't have any held items, so stuff like Crunch or Night Slash would deal more damage.