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As of this writing, Grusha is the only gym leader to be revealed by developers, and more are expected to be announced in the lead-up to the game’s Nov. 18, 2022 release.
Traditionally, as mentioned above, previous Pokémon games would require players to defeat the gym leaders in a specific, linear order in order to progress through the game’s World Map.
Source: https://www.distractify.com/p/pokemon-scarlet-violet-gym-leaders
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