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

Split between a minor and major league.

Pokémon Sword and Pokémon Shield news: Latest leak will help you choose between Ponyta and Darumaka; Nintendo fights back - News

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Where to find Duraludon in Pokémon Sword and Shield - Dot Esports

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

All 18 Galar Gym Leaders & Their NEW Signature Pokemon!

All 18 Galar Gym Leaders & Their NEW Signature Pokemon!

Only 8 Gyms in Pokémon Sword & Shield, The Pokemon Company Clarifies

Debunked) 18 Gyms in Pokemon Sword and Shield!?