Can you rematch gym leaders in Pokémon Scarlet & Violet?

Yes, but technically no In past mainline Pokemon games, rematching gym leaders was a staple of the endgame experience. These

Pokemon Scarlet walkthrough (w/ commentary) Part 48 - All Gym Leader Rematch Battles!

How to Rematch Gym Leaders in Pokemon Scarlet and Violet - Prima Games

If you're worried about being over-leveled here's a path to take based on ace level! : r/PokemonScarletViolet

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Pokémon Scarlet and Violet Artazon gym (Brassius) guide - Polygon

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Pokemon Scarlet & Violet Gym Leader rematch guide: All teams & new levels - Charlie INTEL

Pokemon Scarlet and Violet, Atticus Rematch (STC) - Pokemon Team & Level