It seems will be branching back off into its own plot next episode, heading to a forested area where Brassius claims to have seen Rayquaza with Nemona still accompanying them.

Source: https://screenrant.com/pokemon-horizons-accurate-adaptation-scarlet-violet/

Nemona primarily features in Pokemon Scarlet and Violet's Victory Road storyline, and she has proven to be one of the most popular human characters to come out of the new games.

Source: https://gamerant.com/pokemon-anime-leaks-episodes-nemona-paldea-region-scarlet-violet/