Where to catch Machop

In Hoenn (Ruby, Sapphire & Emerald)

• Fiery Path — Walk
• Jagged Pass — Walk
• Route 112 — Walk

In Johto & Kanto (Gold, Silver & Crystal)

• Mt. Mortar — Walk
• Rock Tunnel — Walk

In Kanto (Red, Blue & Yellow)

• Rock Tunnel — Walk
• Route 10 — Walk

Machop — full Pokédex entry