Thundurus locations — where to catch

In Hisui (Legends: Arceus)

• Lunkers Lair — Static Encounter
• Sands Reach — Static Encounter

Other games (2)

• Ultra Sun / Ultra Moon (Gen 7): Ultra Space Wilds, Ultra Space
• Omega Ruby / Alpha Sapphire (Gen 6): Soaring In The Sky

Thundurus — full Pokédex entry