Where to catch Duskull

In Kitakami (Scarlet & Violet – The Teal Mask)

• Chilling Waterhead — Walk
• Crystal Pool — Walk
• Fellhorn Gorge — Walk
• Infernal Pass — Walk
• Kitakami Wilds — Walk
• Oni Mountain — Walk
• Timeless Woods — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Mt. Pyre — Walk
• Route 121 — Walk
• Route 123 — Walk

Duskull — full Pokédex entry