Pokémon league crash

Just went to challenge the elite 4 and just when the game saves right before entering, it crashes and saves. Now every time I try to play, it comes back to that screen and crashes again without touching anything. Anyone can help?

Try turning off internet entirely or ensuring you’re on a stable network (Simply not connecting to an internet router or using a horrible router will still crash you).

If that doesn’t work, try loading a backup assuming it hasn’t saved 3 times by following this guide: