LogFAQs > #976159740

a certain side quest in the DLC because the game is such a buggy, untested mess.

https://www.reddit.com/r/PokemonScarletViolet/comments/16hyzjn/bug_kitakami_ogre_clan_completion_doesnt_proc/
https://twitter.com/Sibuna_Switch/status/1703757415617835450

The game's data somehow only has enough memory to track up to 300 non-story trainers defeated, but (as of the release of the new Teal Mask DLC) there are now more than 300 such trainers in the game. So if you've already defeated 300 of these trainers and beat another one, the game simply won't register that you defeated them because there's no room in the data for it to do that. They'll just stay there as if you never defeated them, waiting to be battled again. This means that the Ogre Clan side quest in the Teal Mask DLC can be rendered impossible to complete (unless you're willing to start an entirely new save file) if you defeated enough trainers beforehand, because you can't fight the clan master until you beat all of the disciples out in the field, but the disciples won't register as defeated due to this bug if you're at the cap of 300 defeated trainers already.

This game is a joke, this DLC is a joke, and Gamefreak is a joke.