Where to catch Heracross

In Paldea (Scarlet & Violet)

• North Province (Area Two) — Walk
• Socarrat Trail — Walk

In Kitakami (Scarlet & Violet – The Teal Mask)

• Fellhorn Gorge — Walk
• Kitakami Hall — Walk
• Kitakami Wilds — Walk
• Mossfell Confluence — Walk
• Oni Mountain — Walk
• Reveler's Road — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Safari Zone — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Azalea Town — Headbutt, Walk
• Route 29 — Headbutt, Walk
• Route 30 — Headbutt, Walk
• Route 31 — Headbutt, Walk
• Route 32 — Headbutt, Walk
• Route 33 — Headbutt, Walk
• Route 42 — Headbutt, Walk
• Route 43 — Headbutt, Walk
• Route 44 — Headbutt, Walk
• Route 45 — Headbutt
• Route 46 — Headbutt

Heracross — full Pokédex entry