Where to Find Yamask
Generation 1
Red
Blue
Yellow
Generation 2
Gold
Silver
Crystal
Generation 3
Ruby
Sapphire
Emerald
Fire Red
Leaf Green
Generation 4
Diamond
Pearl
Platinum
Heart Gold
Soul Silver
Generation 7
Sun
Moon
Ultra Sun
Ultra Moon
Let's Go Pikachu
Let's Go Eevee
Generation 8
Trade Galarian Yamask at Ballonlea Stadium (Unovan Form)
Route 6 (Galarian Form)
Bridge Field, Dusty Bowl, Giant’s Mirror, Rolling Fields, South Lake Miloch, Stony WildernessSh, Watchtower Ruins (Max Raid Battle) (Galarian Form)
Trade Galarian Yamask at Ballonlea Stadium (Unovan Form)
Route 6 (Galarian Form)
Bridge Field, Dusty Bowl, Giant’s Mirror, Rolling Fields, South Lake Miloch, Stony WildernessSh, Watchtower Ruins (Max Raid Battle) (Galarian Form)
Brilliant Diamond
Shining Pearl
Legends Arceus
Generation 9
Scarlet
Violet
Yamask Evolution Tree
Level 34
Pass under the rock arch in Dusty Bowl after taking at least 49 HP in damage from attacks without fainting (Galarian Yamask only)
Yamask Alternate Forms
Galarian Yamask
Ground
Ghost