There will be 18 gyms in Pokémon Sword and Shield - Dot Esports

Split between a minor and major league.

Galar 18 Gym Leaders by Trainerlouie on DeviantArt

According to Serebii, there will be 18 Gyms in Sword/Shield. Divided up into a minor - and major league!! : r/pokemon

18 Gyms in Pokémon Sword & Shield!? + More Game Informer Details! (No HMs, Autosave, & More!)

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How many gyms will there be in Pokémon Sword and Shield?

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18 Gyms in Pokémon Sword & Shield!? + More Game Informer Details! (No HMs, Autosave, & More!)

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How to soft reset in Pokémon Sword and Shield - Dot Esports

Debunked) 18 Gyms in Pokemon Sword and Shield!?