Fomantis locations — where to catch

In Paldea (Scarlet & Violet)

• South Province (Area Five) — Walk
• Tagtree Thicket — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Apple Hills — Walk
• Kitakami Road — Walk
• Kitakami Wilds — Walk
• Mossfell Confluence — Walk
• Reveler's Road — Walk
• Timeless Woods — Walk
• Wistful Fields — Walk

Other games (3)

• Sword / Shield — The Isle of Armor (Gen 8): Challenge Beach, Fields of Honor, Forest of Focus, Soothing Wetlands, Training Lowlands
• Ultra Sun / Ultra Moon (Gen 7): Alola Route 5, Lush Jungle
• Sun / Moon (Gen 7): Alola Route 5, Lush Jungle

Fomantis — full Pokédex entry