Yanmega locations — where to catch

In Hisui (Legends: Arceus)

• Droning Meadow — Walk
• Gapejaw Bog — Walk
• Heavenward Lookout — Walk

Other games (2)

• Ultra Sun / Ultra Moon (Gen 7): Ultra Space Wilds
• Black 2 / White 2 (Gen 5): Pinwheel Forest, Unova Route 3

Yanmega — full Pokédex entry