Where to catch Illumise

In Kitakami (Scarlet & Violet – The Teal Mask)

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

In Hoenn (Ruby, Sapphire & Emerald)

• Route 117 — Walk

Illumise — full Pokédex entry